Given :
Temperature, T = 55° C = ( 55 + 273 ) K = 328 K .
Volume of container, V = 28.9 dm³ = 0.0289 m³ .
Pressure, P = 144 kPa = 144000 Pa .
To Find :
Number of moles of nitrogen gas.
Solution :
We know, by ideal gas equation :
PV = nRT ( R ( universal gas constant ) = 8.31 J K⁻¹ mol⁻¹ .
[tex]n = \dfrac{PV}{RT}\\\\n = \dfrac{144000\times 0.0289}{8.31 \times 328} \ moles\\\\n = \dfrac{4161.6}{2725.68}\\\\n = 1.53 \ moles[/tex]
Therefore, number of moles of nitrogen gas is 1.53 moles.
An ball with a weight of 0.5 kg is sitting on a shelf that is 3 meters high. Help me! This is 8th grade sci btw.
Complete question:
A ball with a weight of 0.5 kg is sitting on a shelf that is 3 meters high. What is the gravitational potential energy of the ball ?
Help me! This is 8th grade sci btw
Answer:
the gravitational potential energy of the ball is is 14.7 J.
Explanation:
mass of the ball, m = 0.5 kg
height above the ground on which the ball is sitting, h = 3 m
The gravitational potential energy of the ball is calculated as follows;
P.E = mgh
P.E = 0.5 x 9.8 x 3
P.E = 14.7 J
Therefore, the gravitational potential energy of the ball is is 14.7 J.
I NEED THIS LESS THAN 7 MINUTES IYS 15 POINTS!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! What is the difference between a balanced equation and an unbalanced equation?
All of the answers are correct.
A balanced equation obeys the law of conservation of mass, an unbalanced equation does not. An unbalanced equation shows the conservation of mass.
Balanced equations do not show equal numbers of atoms on each side of the equation.
Answer:
Balanced equation have equal number of atoms of different elements in the side of reactants and products.
Answer:
- A balanced chemical equation has an equal numbers of atoms of different elements in the side of reactants and products.
- An unbalanced chemical equation has an unequal number of atoms of one or more elements in the reaction.
Explanation:
what is the difference between quantative and qualitative analysis
Answer:
Quantitative data can be counted, measured, and expressed using numbers. Qualitative data is descriptive and conceptual. Qualitative data can be categorized based on traits and characteristics.
Explanation:
Quantitative analysis involves looking at the hard data, the actual numbers. Qualitative analysis is less tangible. It concerns subjective characteristics and opinions – things that cannot be expressed as a number.
Light is a type of energy produced by the vibration of electrically charged particles.
True or false?
Answer:
big brain
Explanation:
I am doing a break-out room and it won't let me pass I think I have all the other questions correct so this is the only one I'm not sure about.
1. figure one
2. figure two
3. figure three
4. figure two
5. figure one
Answer:
it goes A,C,B,C,A
Explanation:
Please help with this Unit Conversions problem!
"Convert 7.54 kg to mg. Show your work."
Answer:
7,540,000 mg
Explanation:
1 kg = 1,000,000 mg
7.54 kg x 1,000,000= 7,540,000 mg
Now describe the properties of the compound you picked(gold). Compare the properties of the compound with the properties of the elements that comprise it. How do you explain the difference?
Explanation:
Gold conducts heat and electricity. ...
Gold is ductile: It can be drawn out into the thinnest wire. ...
Gold is highly reflective of heat and light. ...
Gold is prized for its beauty. ...
Gold is malleable, so it can be flattened into extremely thin sheets.
on the other hand Gold consist of copper
Key Properties of Copper Alloys
Excellent heat conductivity.
Excellent electrical conductivity.
Good corrosion resistance.
Good biofouling resistance.
Good machinability.
Retention of mechanical and electrical properties at cryogenic temperatures.
Non-magnetic.
so the difference is that copper is less expensive and not priced with its beauty
Why must the mass of reactants in a chemical reaction
always equal the mass of products?
Answer:
law of conservation
Explanation:
matter cannot be destroyed nor made
A study was conducted to see if increasing the substrate concentration has an appreciable effect on the velocity of a chemical reaction. With a substrate concentration of 1.5 moles per liter, the reaction was run 15 times, with an average velocity of 7.5 micromoles per 30 minutes and a standard deviation of 1.5. With a substrate concentration of 2.0 moles per liter, 12 runs were made, yielding an average velocity of 8.8 micromoles per 30 minutes and a sample standard deviation of 1.2. Is there any reason to believe that this increase in substrate concentration causes an increase in the mean velocity of the reaction of more than 0.5 micromole per 30 minutes
Answer:
There is not enough evidence
Explanation:
For 1.5 moles substrate concentration per liter
Reaction ( n2 ) = 15 runs
average velocity ( x2 ) = 7.5 micromoles per 30 minutes
standard deviation ( s2 ) = 1.5
For 2.0 moles substrate concentration per liter
Reaction( n1 ) = 12 runs
average velocity ( x1 ) = 8.8 micromoles per 30 minutes
standard deviation ( s1 ) = 1.2
Show Reason to believe that this increase in substrate conc causes an increase in mean velocity
Hypothesis test
H0 : μ1 - μ2 = 0.5
H1 : μ1 - μ2 > 0.5
level of significance ( ∝ ) = 0.01
attached below is a detailed solution to the problem
P-value ( 0.073 ) > level of significance ( 0.01 ) hence we fail to reject the null hypothesis
hence there in not enough evidence to believe that this increase causes an increase in the mean velocity of the reaction of more than 0.5 micromole per 30 minutes
How many grams of KCl are made when 5.02 moles of
ZnCl2 react in the reaction below?
2KMnO4 + ZnCl2 → 2KCl + Zn(MnO4)2
lol pls help me
Answer: 747.98 grams of KCl are made when 5.02 moles of [tex]ZnCl_2[/tex] react in the reaction.
Explanation:
The balanced chemical equation is:
[tex]2KMnO_4+ZnCl_2\rightarrow 2KCl+Zn(MnO_4)_2[/tex]
According to stoichiometry:
1 mole of [tex]ZnCl_2[/tex] produce = 2 moles of [tex]KCl[/tex]
Thus 5.02 moles [tex]ZnCl_2[/tex] will produce =[tex]\frac{2}{1}\times 5.02=10.04[/tex] moles of [tex]KCl[/tex]
Mass of [tex]KCl=moles\times {\text {molar mass}}=10.04mol\times 74.5g/mol=747.98g[/tex]
Thus 747.98 grams of KCl are made when 5.02 moles of [tex]ZnCl_2[/tex] react in the reaction.
How many atoms are in 14 moles of I? Watch your significant figures.
8.4 x 1024 atoms of l
8.43 x 1024 moles of I
8.4 x 1023 atoms of l
8.43 atoms of l
Answer:
8.43 x 1024 moles of I
Explanation:
What is the volume, in L, of 2.50 moles of oxygen gas measured at 25.0oC and a pressure of 104.5 kPa?
Answer:
58.53 L
Explanation:
Ideal gas equation is
PV = nRT
P - the pressure of the gas = 104.5 KPa
V- the volume occupied by the gas
n - the number of moles of gas =2.50
R - the universal gas constant, usually given as 0.0821 atm.L/(mol K)
T - the absolute temperature of the gas.= 298K
[tex]V =\frac{nRT}{P}[/tex]
Now substituting vales we get
[tex]V = \frac{2.5\times0.0821\times298}{104.5\times1000}[/tex]
V = 58.53 L
Why the colloid can't be filitred?Write it's 4 examples.
Answer:
Constituent substances of a colloid cannot be separated by ordinary filtration because the size of the particles in a colloid (or colloidal solution) is bigger than those in a true solution but smaller than those in suspension. It is between 1 nm to 100 nm in diameter.
ex- cheese, milk, aerosol spray, mayonnaise
How many grams of glycerine, C3H8O3, are needed to make 100. mL of 2.60 M solution?
Answer:
the mass of the glycerine needed in the given solution is 23.92 g
Explanation:
Given;
molarity of the solution (C₃H₈O₃), C = 2.60 M
Volume of the solution, V = 100 mL = 100 x 10⁻³ L = 0.1 M
The molarity of a solution is given as follows;
[tex]Molarity = \frac{amount \ of \ solute \ (moles)}{volume \ of \ solution \ (L)} \\\\amount \ of \ solute \ (moles) = Molarity \ \times volume \ of \ solution \ (L)\\\\amount \ of \ solute \ (moles) = 2.6 \times 0.1 \\\\amount \ of \ solute \ (moles) = 0.26 \ mole[/tex]
The molecular mass of the given solution;
molecular mass = (12 x 3) + (8 x 1) + (16 x 3)
molecular mass = 92 g/mol
The mass of the glycerine needed in the given solution is calculated as follows;
reacting mass = amount of solute (moles) x molecular mass (g/mol)
reacting mass = 0.26 x 92
reacting mass = 23.92 g
Therefore, the mass of the glycerine needed in the given solution is 23.92 g
Can someone please help
Answer:
5.
A. Period
B. Group
6. C
Explanation:
Predict: Based on your hypothesis, which population(s) would be hurt if bears were added?
Answer:
all of em, unless the bear is normal to the environment
Those microscopic organisms perform what 2 processes that help pave the way for lichen by creating organic material.
Answer:
Decomposition pf residues and weathering of rock.
Explanation:
Microorganisms performs two processes such as decomposition and weathering of rock materials. These two processes make the medium suitable for the growth and development of the lichens because these processes increases nutrient and organic matter on the rock surface that is used by the lichens for its growth. In decomposition process, larger compounds are broken down into simpler substances while on the other hand, the weather of rocks causes breakdown of rock material into simpler minerals that also used by the lichens.
What is the new pressure if the temperature outside is 296k and his weight causes the tire's volume to drop to 2.0 liters
Question:
At standard temperature and pressure, the volume of a tire is 3.5L. What is the new pressure if the temperature outside is 296k and its weight causes the volume of the gas is 2.0 L?
Answer:
The new pressure is: 1.896 atm
Explanation:
At standard temperature and pressure, we have:
[tex]P_1 = 1atm[/tex]
[tex]T_1 = 273.15k[/tex]
[tex]V_1 = 3.5L[/tex]
Outside, we have:
[tex]T_2 = 296k[/tex]
[tex]V_2 = 2.0L[/tex]
Required
Determine the new pressure
Using combined gas law, we have:
[tex]\frac{P_1V_1}{T_1} =\frac{P_2V_2}{T_2}[/tex]
This gives:
[tex]\frac{1 * 3.5}{273.15} =\frac{P_2*2.0}{296}[/tex]
Solve for [tex]P_2[/tex]
[tex]P_2 = \frac{296 * 1 * 3.5}{273.15*2.0}[/tex]
[tex]P_2 = \frac{1036}{546.30}[/tex]
[tex]P_2 \approx 1.896 atm[/tex]
Acid HX has a very large Ka. How will the relative amounts of H+ and HX
compare at equilibrium?
A)The concentration of H+ will be larger than HX
B)The concentration of HX will be larger than H+
C)The concentration of HX will be equal to H+
1. what is an ethical concern about biotechnology
2. list 2 examples of transgenic organism
3. write a 3-sentences summary on how biotechnology affects individual, society, and environment
Answer:
1. There are so many ethical concerns about biotechnology, some Ethical issues that arise from the application of modern biotechnologies include:
Discrimination of individuals because of their health or health history as a result of knowing their genetic information, minimizing harms while maximizing benefits, Interference with nature, privacy.
2. a. Plants (maize, rice)
b. Fish (GloFish)
3. For individuals, biotechnology has helped in the prevention and treatment of a wide range of diseases. For society, biotechnology saves time, improves the health and quality of food through a reduction in the use of pesticides and it can create new viruses and bacteria that cause diseases. Biotechnology could address global change since more genetically modified plants are grown.
Which of the follow can NOT be possible
error that occurs during a lab experiment?
human error
pure reactants were used
thing
O unexpected products were produced
the reaction didn't go to completion
Answer:did h find the answer
Explanation:
NO FILES OR LINKS PLEASE HELPPPP IVE ASKED THIS 3 TIMES AND ALL I GET IS SCAM FILES ILL GIVE YOU BRAINLIEST PLEASE
What is the skeleton equation for
CuSO4 + 2NaOH → Cu(OH)2 + Na2SO Copper sulfate + Sodium hydroxide --> copper hydroxide + sodium sulfate
Answer:
*Inserting real answer*
Explanation:
I think CuSO4 + 2NaOH → Cu(OH)2 + Na2SO4 is the skeleton equation.
If I am wrong I am so sorry!!!
Have a nice day! :)
Also sorry for all the fake answers you have been getting that happened to me too TnT
An organ system is formed by..
A) two or more cells working together.
B) two or more tissues working together.
C) two or more organs working together.
D) two or more organisms working together
convert 5.91 x 10^26 molecules h20 to moles
Answer:
0.432 mol
Explanation:
Divide the given number of molecules by Avogadro's constant. Avogradro's constant is the number of atoms/molecules in a mole of a substance.
Therefore,
2.60
⋅
10
23
molecules
6.022
⋅
10
23
molecules/mol
=
0.432175 moles
≈
0.432 moles
Explanation:
How many grams are in 4.5 x 10^22 molecules of water? please show dimensional analysis
Answer:
1.1grams
Explanation:
Find moles of water:
4.5x10^22/(6.02x10^23)=0.07mol
Find molar mass of the water
O=16.00g/mol
0.07x 16.00=1.1 grams
There are moles of carbon present in 100 g of a
compound with the following percentage composition:
C= 40.0%, H = 6.72%, O = 53.29%.
Answer: 3.33
Explanation:
The molecular formula of the given composition is C₃H₆O₃.
What is molecular formula?Molecular formula is defined as a compound's chemical formula, which counts the total number of each element present in a molecule of the compound as discrete molecules. The arrangement of atoms in a molecule in three dimensions is known as molecular geometry, commonly referred to as the molecular structure.
The percentage composition is
C = 40.00 %
H = 6.72 %
O = 53.29 %
Mole = 100 g
Mass of C = 40 / 100 x 100 = 40 g
mass of H = 6.72 / 100 x 100 = 6.72 g
Mass of O = 53.29 / 100 x 100 = 53.29 g
Dividing the mass with moles
C = 40 / 12 = 3.3
H = 6.72 / 1 = 6.72
O = 53.29 / 16 = 3.3
Formula = C₃H₆O₃
Thus, the molecular formula of the given composition is C₃H₆O₃.
To learn more about molecular formula, refer to the link below:
https://brainly.com/question/28647690
#SPJ2
I need help in this :(
Answer:
ok follow me twitter dm me for answer The Kid D is my twitter
Explanation:
Help me pretty please
Answer:
I'm pretty sure light waves do not require a medium to travel
An atom of a certain element has 19 protons, 19 electrons, and a mass number of 39. This element is very reactive. How many neutrons are in this atom?
Record your answer and fill in the bubbles on your answer document. Be sure to use the correct place value.
Answer:
There are 20 neutrons in this atom.
Explanation:
If 335 g water at 35.5C loses 5750 J of heat, what is the final temperature of the water?
Answer:
The final temperature is 39.58 degree Celsius
Explanation:
As we know
Q = m * c * change in temperature
Specific heat of water (c) = 4.2 joules per gram per Celsius degree
Substituting the given values we get -
5750 = 335 * 4.2 * (X - 35.5)
X = 39.58 degree Celsius