Answer:
94 are naturally made on earth
Explanation:
Answer:
94 or 98, i think.
Explanation:
The measured quantity 0.00410 g written in scientific notation is _______. Using prefixes, the number can be written as ________.
Answer:
4.10x10⁻³g.
4.10 mg.
Explanation:
Hello,
In this case, considering the given number, we can see it has two digits after the first nonzero digit that is four (4) which is also at the third decimal place, it means that the scientific notation has a negative power as it is at the left of the given zeros, therefore it is:
4.10x10⁻³g.
Moreover, since the proper prefix for the factor x10⁻³ is milli, the number with prefix is:
4.10 mg.
Best regards.
Which of the following statements correctly represents the relationships between molecular motion and pressure?
a. The greater the molecular motion, the less pressure the molecules exert
b.The greater the molecular motion the greater the pressure the molecules exert
c. Molecular motion is not related to the pressure the molecules exert
d. None of the above
The van der Waals equation for real gases recognizes that:
A. the molecular attractions between particles of a gas decrease the pressure exerted by the gas
B. the non-zero volumes of gas particles effectively decrease the amount of "empty space" between them
C. gas particles have non-zero volumes and interact with one another
D. molar volumes of gases of different types are different
E. All of the above statements are correct
Answer:
E. All of the above statements are correct
Explanation:
The gas equation given below and which we are familiar with relates to ideal gases and not to real gases .
P V = R T
In this equation , it has been assumed that gas molecules have no mutual attraction . They do not occupy any space ie they are very small in volume . But in reality , gas molecules do have mutual attraction and also they occupy some space. . Considering these facts , a new formula was given to replace the gas equation which is written below .
(P - a / V² ) ( V - b ) = R T , a and b are constant and depend upon nature of gas involved .
This is called van der Waals equation . This is for one mole .
Here we see P of previous gas equation is replaced by P - a / V² .
That means pressure of real gas is less than the ideal gas . It is due to mutual attraction between any two gas molecules. V of previous gas equation is replaced by V - b . That means volume of empty space has been reduced . It is due to the fact that real gas molecules occupy some space . Here b is dependent on the nature of the gas.
So all the statements are correct .
The van der Waals equation for real gases recognizes that gas particles have non-zero volumes and interact with one another.
The ideal gas equation is used to describe the relation among the volume, pressure and temperature of an ideal gas. Recall that the ideal gas equation holds that there is no intermolecular interaction between gas molecules and that gas molecules occupy zero volume relative to the volume of the container.
The van der Waals equation for real gases recognizes that gas particles have non-zero volumes and interact with one another.
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Ammonium perchlorate nh4clo4 is a powerful solid rocket fuel, used in the space shuttle boosters. it decomposes into nitrogen n2 gas, chlorine cl2 gas, oxygen o2 gas and water vapor, releasing a great deal of energy. calculate the moles of ammonium perchlorate needed to produce 1.4 of nitrogen. be sure your answer has a unit symbol, if necessary, and round it to the correct number of significant digits.
Answer:
Explanation:
2 NH₄ClO₄ ⇒ N₂ + Cl₂ + 2O₂ + 4 H₂O
2 moles 1 mole
We are required to produce 1.4 moles of N₂ from ammonium perchlorate .
1 mole of N₂ is produced by 2 moles of ammonium perchlorate
1.4 moles of N₂ will be produced by 2 x 1.4 = 2.8 moles of ammonium perchlorate .
Answer is 2.8 moles .
A sample of marble has a volume of 8cm and density of 2.75g/cm. What is mass?
Answer:
22.0 g
Explanation:
To find the mass, multiply the volume by the density.
8 cm³ × 2.75 g/cm³ = 22.0 g
The marble is 22.0 g.
How many atoms of zirconium are in 0.3521 mol of zirconium?
Answer:
2.12×10²³ atoms.
Explanation:
From Avogadro's hypothesis, we understood that 1 mole of any substance contains 6.02×10²³ atoms. This simply means that 1 mole of zirconium also 6.02×10²³ atoms.
Thus, we can obtain the number of atoms present in 0.3521 mole of zirconium as follow:
1 mole of zirconium also 6.02×10²³ atoms.
Therefore, 0.3521 mole of zirconium will contain = 0.3521 × 6.02×10²³ = 2.12×10²³ atoms.
Therefore, 0.3521 mole of zirconium contains 2.12×10²³ atoms.
There are 2.12 × 10²³ atoms of zirconium in 0.3521 mol of zirconium.
HOW TO CALCULATE NUMBER OF ATOMS:
The number of atoms of zirconium can be calculated by multiplying the number of moles in the element with Avogadro's number. That is;no. of atoms in Zirconium = no. of moles = 6.02 × 10²³According to this question, 0.3521 mol of zirconium was given. The number of atoms can be calculated as follows:no. of atoms of Zirconium = 0.3521 × 6.02 × 10²³no. of atoms of Zirconium = 2.12 × 10²³ atoms. Therefore, there are 2.12 × 10²³ atoms of zirconium in 0.3521 mol of zirconium.Learn more at: https://brainly.com/question/15488332?referrer=searchResults
What mass of Sodium Chloride is required to make 100.0 mL of 3.0 M solution?
Answer:
17.55 g of NaCl
Explanation:
The following data were obtained from the question:
Molarity = 3 M
Volume = 100.0 mL
Mass of NaCl =..?
Next, we shall convert 100.0 mL to L. This can be obtained as follow:
1000 mL = 1 L
Therefore,
100 mL = 100/1000
100 mL = 0.1 L
Therefore, 100 mL is equivalent to 0.1 L.
Next, we shall determine the number of mole NaCl in the solution. This can be obtained as follow:
Molarity = 3 M
Volume = 0.1 L
Mole of NaCl =?
Molarity = mole /Volume
3 = mole of NaCl /0.1
Cross multiply
Mole of NaCl = 3 × 0.1
Mole of NaCl = 0.3 mole
Finally, we determine the mass of NaCl required to prepare the solution as follow:
Mole of NaCl = 0.3 mole
Molar mass of NaCl = 23 + 35.5 = 58.5 g/mol
Mass of NaCl =?
Mole = mass /Molar mass
0.3 = mass of NaCl /58.5
Cross multiply
Mass of NaCl = 0.3 × 58.5
Mass of NaCl = 17.55 g
Therefore, 17.55 g of NaCl is needed to prepare the solution.
Fe(OH)2 Spell out the full name of the compound.
Answer:
Ferrous hydroxide or iron (II) hydroxide.
Explanation:
Hello,
In this case, for the nomenclature of hydroxides we can use two styles:
a. IUPAC: it points out the oxidation state of the given metal by using suffixes ous or ic for metals having to oxidation states, thus, since +2 for iron is the first one, it turns out ferrous hydroxide.
b. Stock: it points out the oxidation state of the given metal by writing it inside parenthesis, thus, it turns out iron (II) hydroxide.
Regards.
The full name of the compound is ferrous hydroxide or iron (II) hydroxide.
Ionic compounds are formed when ions with opposing negative and positive charges form ionic bonds and form compounds, which are compounds made of ions.
Ionic compounds are named by stating the cation first, followed by the anion. When a neutral atom loses one or more electrons, it acquires a positive charge and is called a cation and when an atom gains one or more electrons, it becomes an anion and acquires a negative charge.
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C=82.76% H=17.24% Molecular formula ???
Answer:
ok
Explanation:
Element %composition Mol. mass No. of C atoms Simplest Rounding
ratio off
C 82.76 12 6.89 1× 2 2
H 17.24 1 17.24 2.5× 2 5
Number of carbon atoms present =
12
82.76
=6.89
Number of hydrogen atoms present =
1
17.24
=17.24
simplest ratio =
6.89
6.89
=1
simplest ratio =
6.89
17.24
=2.5
∴ Empirical fromula is C
2
H
5
Empirical formula mass= 2×12+5 = 29
∴ V.D. = 29
Mol. mass = 2 × V.D.
=58
n=
Empiricalformulamass
Molecularmass
=
29
58
=2
∴ Molecular formula = C
4
H
10
pls mark me as braillant
What reasons can you give for people to pursue discoveries in chemistry?
Answer:
cure problems
pollution
purifying water
crop production
Explanation:
The reasons for people to pursue discoveries in chemistry because it is the most important part of daily life and related to the human health too.
What is chemistry?Chemistry is a field of science which deals with the chemicals present in laboratory or in our environment o related to human body also.
Their are main 3 branches of chemistry that is organic and inorganic and physical chemistry some others are too like analytical chemistry industrial chemistry pharmaceutical chemistry.
Organic chemistry deals with the carbon compounds and hydrogen compound inorganic chemistry deals with the elements of periodic table and pharmaceutical makes medicines for human health care.
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What happens to the density of a material if you have a larger piece of it?(1 point) A.The density will be smaller because the mass remains the same as the volume increases.
B.The density will remain the same because mass and volume will both increase in the same way.
C. The density will remain the same because mass and volume will remain the same. D.The density will be greater because the mass increases but the volume remains the same.
PLEASSSSSSSSSSSSSE HELPPPPPPPPPPPPP ASAP.........
The change in the density of a material, if you have a larger piece of it, is the density will remain the same because mass and volume will remain the same. The correct option is C.
What is density?Density is mass per volume. It is calculated by dividing the mass by the volume of the substance. It is a scalar quantity, and it is denoted by rho a Greek symbol. Furthermore, it is written in small d.
The density, mass, and volume are related to each other. These quantities do not change with the change in the quantity of the substance. If we take the large weight or quantity of substance, the density of the substance does not change.
Thus, the correct option is C. The density will remain the same because mass and volume will remain the same.
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Which of the following have a neutral charge. Electron, plasma, neutron, or proton
In an ion with an unknown charge, the total mass of all the electrons was determined to be 1.640 x [tex]10^{-26}[/tex] g, the total mass of its protons was 4.015 x [tex]10^{-23}[/tex] g, and the total mass of its neutrons was 4.690 x [tex]10^{-23}[/tex] g. What is the identity, charge, and mass number of this ion? Electron one mass = 9.109 x [tex]10^{-31}[/tex] Proton one mass = 1.673 x [tex]10^{-27}[/tex] Neutron one mass = 1.675 x [tex]10^{-27}[/tex]
What is the mass percent of sucrose (C12H22O11, Mm = 342 g/mol) in a 0.329-m sucrose solution?
Answer:
[tex]\% m/m=10.1\%[/tex]
Explanation:
Hello,
In this case given the molal solution of sucrose, we can assume there are 0.329 moles of sucrose in 1 kg of solvent, thus, computing both the mass of sucrose and solvent in grams, we obtain:
[tex]m_{sucrose}=0.329mol*\frac{342g}{1mol}=112.5g[/tex]
[tex]m_{solvent}=1000g[/tex]
In such a way, we proceed to the calculation of the mass percent as follows:
[tex]\% m/m=\frac{112.5g}{112.5g+1000g}*100\%\\ \\\% m/m=10.1\%[/tex]
Regards.
Initially, scientists described atoms as the smallest particles of matter. However, smaller particles within atoms were discovered. How did the scientific world respond to this new information? by ignoring the new information because it went against a scientific law by discarding the old theory about atoms and making a new one by revising the theory that explained atoms to include this new information by designing new technology that would prove the new information was wrong
Answer:
By designing new technology that would prove new information
Explanation:
im not sure about the answer but i just did the test and "by designing new technology that would prove the new information was wrong" isint the answer
blance equation __CaBr2 (aq) + ___Li3PO4(aq) → ___Ca3(PO4)2(s) + ____LiBr (aq)
Answer:
3CaBr2 + 2LI3PO4 - > Ca3(PO4) 2 + 6LiBr
Explanation:
The first one I did was PO4. There are two on the right side, so I added 2 to Li3PO4 on the other side. That balanced the PO4s and then gave me 6 Lithiums so I balanced that one next on the right side. I added 6 to LiBr which balanced the Li but then gave me 6 Br, so I finished it off by adding 3 in front of CaBr2 which balanced the calcium and bromines.
Here was the process:
CaBr2+2Li3PO4 -> Ca3(PO4)2+LiBr
Balances PO4 (2on both sides)
CaBr2+2Li3PO4 -> Ca3(PO4)2+6LiBr
Balances Lithiums (6 on each side)
3CaBr2+2Li3PO4 -> Ca3(PO4)2+6LiBr
Balances Calciums and Bromines (3 Calciums and 6 Bromines each side)
Hope this helped!
Each of these geometric shapes has adifferent number of sides. Arrange the shapes in order from theshape with the greatest number of sides to the shape with thefewest number of sides.Rank these shapes from greatest tofewest number of sides. To rank items as equivalent, overlapthem.triangle , square, rectangle, octagon, hexagon, pentagon
Answer:
Octagon > Hexagon > pentagon > square and rectangle > triangle
Explanation:
As we know that
Triangle contains 3 slides
Rectangle contains 4 slides
Square contains 4 slides
Octagon contains 8 slides
hexagon contains 6 slides
Pentagon contains 5 slides
Now based on this
The ranking is as follows
Octagon > Hexagon > pentagon > square and rectangle > triangle
This is the correct order from high to low
In the Chocolate Chip Rock Cycle Lab,
what was represented by stirring the
melting chips with a spatula?
B. convection currents
A. weathering
C. deposition
D. erosion
List the 7 examples of energy sources that produce steam to turn the turbines of an electric generator.
Answer:
The fuels or energy sources used for steam turbines include biomass, coal, geothermal energy, petroleum fuels, natural gas, nuclear energy, and solar thermal energy. Most of the largest electric power plants in the United States have steam turbines.
Explanation: I hope dis help you !
The bird bobbed its head up and down.
A) qualitative
B) quantitative
"The bird bobbed its head up and down" it is qualitative. So, A is correct.
What is quantitative and qualitative?Quantitative data is numbers-based, countable, or measurable. Qualitative data is interpretation-based, descriptive, and relating to language. Quantitative data tells us how many, how much, or how often in calculations. Qualitative data can help us to understand why, how, or what happened behind certain behaviors.
That statement given in the question is not telling us about any quantity or any number, it is telling us about certain behavior.
Quantitative Information – Involves a measurable quantity—numbers are used. Some examples are length, mass, temperature, and time. Quantitative information is often called data, but can also be things other than numbers. Qualitative Information – Involves a descriptive judgment using concept words instead of numbers.
Therefore, "The bird bobbed its head up and down" it is qualitative. So, A is correct.
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5. A gas has a pressure of 1.26 atm and occupies a volume of 7.40 L. If the gas
compressed to a volume of 2.93 L, what will its pressure?
Answer:
0.499atm
Explanation:
The formula is
P1/V1 = P2/V2
so:
1.26atm/7.40L = P2/2.93L
then:
(1.26atm/7.40L)*2.93L = P2
= 0.4988918911atm
the answer must have 3 sig figs
The total volume of seawater is 1.5 x 10²¹ L. Seawater contains approximately 3.5% sodium chloride by mass. At that high of a concentration of salt within the water, the density of water is 1.03 g/mL. Calculate the total mass of sodium chloride, in grams, contained in all the seawater in the world.
Answer:
There are [tex]5.408\times 10^{22}[/tex] grams contained in all the seawater in the world.
Explanation:
At first let is determinate the total mass of seawater ([tex]m_{sw}[/tex]), measured in grams, in the world by definition of density and considering that mass is distributed uniformly:
[tex]m_{sw} = \rho_{sw}\cdot V_{sw}[/tex]
Where:
[tex]\rho_{sw}[/tex] - Density of seawater, measured in grams per liters.
[tex]V_{sw}[/tex] - Volume of seawater, measured in liters.
If [tex]V_{sw} = 1.5\times 10^{21}\,L[/tex] and [tex]\rho_{sw} = 1030\,\frac{g}{L}[/tex], then:
[tex]m_{sw}=\left(1030\,\frac{g}{L} \right)\cdot (1.5\times 10^{21}\,L)[/tex]
[tex]m_{sw} = 1.545\times 10^{24}\,g[/tex]
The total mass of sodium chloride is determined by the following ratio:
[tex]r = \frac{m_{NaCl}}{m_{sw}}[/tex]
[tex]m_{NaCl} = r\cdot m_{sw}[/tex]
Given that [tex]m_{sw} = 1.545\times 10^{24}\,g[/tex] and [tex]r = 0.035[/tex], the total mass of sodium chloride in all the seawater in the world is:
[tex]m_{NaCl} = 0.035\cdot (1.545\times 10^{24}\,g)[/tex]
[tex]m_{NaCl} = 5.408\times 10^{22}\,g[/tex]
There are [tex]5.408\times 10^{22}[/tex] grams contained in all the seawater in the world.
Following are the calculation to the total mass of sodium chloride in grams:
Given:
Seawater volume[tex]= 1.5 \times 10^{21}\ L\\\\[/tex]
Seawater density [tex]= 1.03\ \frac{g}{mL}\\\\[/tex]
[tex]\%[/tex] of sodium chloride in seawater [tex]= 3.5\ \%[/tex]
To find:
The total mass of sodium chloride in grams=?
Solution:
The total volume of seawater [tex]= 1.5 \times 10^{21}\ L= 1.5 \times 10^{24}\ mL\\\\[/tex]
The density of seawater [tex]= 1.03 \frac{g}{mL}[/tex]
[tex]\therefore\\\\[/tex]
Seawater mass = Seawater volume [tex]\times[/tex] density
[tex]= 1.5 \times 10^{24}\times 1.03 \ g\\\\= 1.545 \times 10^{24}\ g\\\\[/tex]
[tex]\%[/tex] of sodium chloride in seawater [tex]= 3.5\ \%[/tex]
[tex]\therefore\\\\[/tex]
Calculating the sodium chloride mass in Seawater:
[tex]= 3.5\% \ \ of\ \ 1.545 \times 10^{24} \ g\\\\ =\frac{3.5}{100} \times 1.545 \times 10^{24}\ g\\\\= 5.4075 \times 10^{22} \ g\\\\[/tex]
Calculating the sodium chloride mass [tex]= 5.4075 \times 10^{22} \ g\\\\[/tex]
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Which type of basin forms at divergent boundaries
Answer:
A: rift
Explanation:
Divergent boundaries within continents initially produce rifts, which produce rift valleys.
Answer:
rift just did the quiz
If a buffer solution is 0.260 M in a weak acid (Ka=8.3×10−5) and 0.480 M in its conjugate base, what is the pH?
Answer: pH = 4.3
Explanation: The pH of a buffer solution and its conjugate base can be determine by the Henderson-Hasselbach Equation. It can be estimated because equilibrium between weak acid and its conjugate base allows the solution to not change pH when small amounts of strong acid or base are added.
pH is calculated by:
[tex]pH = pK_{a} + log(\frac{[conjugate]}{[acid]} )[/tex]
pKa is the acidic dissociation constant and it shows how much strong an acid can be. It is determined as:
[tex]pK_{a}=-log(K_{a})[/tex]
For the buffer solution:
[tex]pK_{a}=-log(8.3.10^{-5})[/tex]
[tex]pK_{a}=4.081[/tex]
Calculating pH:
[tex]pH = 4.081 + log(\frac{0.480}{0.260} )[/tex]
[tex]pH = 4.081 + log(1.846)[/tex]
pH = 4.3
For this buffer solution and its conjugate, pH = 4.3
what has properties of both metals and nonmetals
Answer:
Metalloids.
Explanation:
they're between the metals and non metals in the periodic table
The concentration of protein in a urine sample is calculated to be 2.77 μg/mL. What is the concentration of this solution in units of pounds per gallon (lb/gal)?
Answer:
The concentration of this solution in units of pounds per gallon is [tex]2.776*10^{-5} \frac{lb}{gal}[/tex]
Explanation:
Units of measurement are established models for measuring different quantities. The conversion of units is the transformation of a quantity, expressed in a certain unit of measure, into an equivalent one, which may or may not be of the same system of units.
In this case, the conversion of units is carried out knowing that 1 μg are equal to 2.205*10⁻⁹ Lb and 1 mL equals 0.00022 Gallons. So
[tex]2.77 \frac{ug}{mL} = \frac{2.77 ug}{mL}[/tex]
If 1 μg equals 2.205*10⁻⁹ lb, 2.77 μg how many lb equals?
[tex]lb=\frac{2.77ug*2.205*10^{-9}lb }{1ug}[/tex]
lb=6.10785*10⁻⁹
So, 2.77 μg= 6.10785*10⁻⁹ lb
Then:
[tex]2.77 \frac{ug}{mL} = \frac{2.77 ug}{mL}=\frac{6.10785*10^{-9}lb }{mL} =\frac{6.10785*10^{-9}lb }{0.00022 gal} =\frac{6.10785*10^{-9}lb }{0.00022 gal}[/tex]
You get:
[tex]2.77 \frac{ug}{mL} = 2.776*10^{-5} \frac{lb}{gal}[/tex]
The concentration of this solution in units of pounds per gallon is [tex]2.776*10^{-5} \frac{lb}{gal}[/tex]
Walter is observing a substance that is currently a solid. What would have to
occur for the substance to become a liquid?
Answer:
Increasing the temperature
Explanation:
Solids are usually found in low-temperature conditions. Increasing the temperature increases the energy in the solids, causing the solids to turn into a liquid state. Increasing the energy between molecules in a substance reduces the attraction force between the molecules and changes them from solid to liquid state.
The human gut microbiome is a collection of microbes that are necessary for proper function of the digestive system and that contribute to the overall health of the individual. Infants are colonized with these microbes at birth and their nutrition in the early days of life is important for supporting growth of these microbes. Milk sugars are important in development of the microbiome. Which of the following best explains how both lacto-N-tetraose and lacto-N-fucopentaose could contribute to proper development of an infant's microbiome
A. Lacto-N-fucopentaose binds to surface receptors on pathogenic bacteria and prevents them from entering epithelial cells in the intestine.
B. Lacto-N-tetraose prevents pathogenic bacteria from hydrolyzing and metabolizing carbohydrates found in the intestine.
C. Lacto-N-tetraose is a food source for bacteria that aid in digestion of this and other oligosaccharides.
D. Lacto-N-fucopentaose is digested by pathogenic bacteria and, in the process, destroys these types of bacteria.
Answer:
A. Lacto-N-fucopentaose binds to surface receptors on pathogenic bacteria and prevents them from entering epithelial cells in the intestine.
C. Lacto-N-tetraose is a food source for bacteria that aid in digestion of this and other oligosaccharides.
Explanation:
Human milk contains high levels of indigestible Human milk oligosaccharides (HMOs). It is believed that these HMOs influence the process of coevolution of the nursing infant and its microbiome. Lacto-N-fucopentaose (LNFP) is a carbohydrate (i.e., an oligosaccharide) found in human milk. This oligosaccharide is a bioactive molecule that acts as a substrate for the development of the intestinal microflora. LNFP binds to proteins (to form glycoproteins) and lipids (to form glycolipids) localized on the surface of cells. Moreover, Lacto-N-tetraose (LNT) is also an oligosaccharide found in human milk, which is used as food supplement. It has been shown that LNT prevents infection by inhibiting the adhesion mechanism of harmful bacteria and their toxins. Furthermore, LNT stimulates the development of the microbiome in early life.
What is the specific gravity of mercury, the liquid used in thermometers, if it has a density of
13.6 g/mL?
Answer:
13.64.
Explanation:
Hello,
In this case, since the the specific gravity is computed as the ratio of the density of the given substance by the density of water that is approximately 0.997 g/mL as shown below:
[tex]s.g=\frac{\rho}{\rho _{water}}[/tex]
In such a way, for this case, we find:
[tex]s.g=\frac{13.6g/mL}{0.997g/mL}=13.64[/tex]
Which is dimensionless due the g/mL simplification.
Best regards.
The specific gravity of mercury is 13.61
Specific gravity is defined as the ratio of the density of a substance to the density of water. Mathematically;
[tex]sg=\frac{\rho_s}{\rho_{water}}[/tex]
Given the following parameters:
[tex]\rho_{Hg}=13.6g/mL\\\rho_{H_2O}=0.9998g/mL[/tex]
Substitute the given parameters into the formula;
[tex]sg=\frac{13.6g/mL}{0.9998g/mL}\\sg=13.61[/tex]
Hence the specific gravity of mercury is 13.61
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hrough the complete electrolysis of a sample of pure water, a student collects 14.0 grams of hydrogen gas and 112.0 grams of oxygen gas. What mass of water (in grams), if it reacted completely, was initially present? (The electrolysis of water is the use of an electric current to decompose it into its component elements.)
Answer:
126g of H₂O
Explanation:
Electrolysis of water is:
2H₂O(l) → 2H₂(g) + O₂(g).
To know mass of water that reacted, we need to find moles of hydrogen and oxygen and, by using electrolysis chemical equation, we can determine moles of water and its mass, thus:
Moles hydrogen (Molar mass: 2.01g/mol):
14.0g H₂ * (1mol / 2.01g) = 6.97 moles hydrogen
Moles Oxygen (Molar mass: 32g/mol):
112.0g O₂ * (1 mol / 32g) = 3.5 moles oxygen
As 2 moles of hydrogen and 1 mole of oxygen are produced from 2 moles of water, and 7 moles of hydrogen and 3.5 moles of oxygen were collected, moles of water that reacted were 7 moles H₂O.
As molar mass of water is 18g/mol, mass of 7 moles of H₂O is:
7 mol H₂O * (18g / mol) =
126g of H₂O