CHEMISTRY HIGH SCHOOL

The pressure of 1 mol of gas is decreased to 0.5 atm at 273 K. What happens to the molar volume of the gas under these conditions?

Answers

Answer 1

Answer:

Answer : The molar volume of the gas will be, 44.82 L

Solution :

Using ideal gas equation,

$PV=nRT$

where,

n = number of moles of gas = 1 mole

P = pressure of the gas = 0.5 atm

T = temperature of the gas = 273 K

R = gas constant = 0.0821 Latm/moleK

V = volume of the gas.

Now put all the given values in the above equation, we get the molar volume of the gas.

$(0.5atm)* V=(1mole)* (0.0821Latm/moleK)* (273K)$

$V=44.82L$

Therefore, the molar volume of the gas will be, 44.82 L

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What element was used to make the first atomic bomb

Answers

The element was uranium, it was made during World War II ( the first atomic bomb was dropped on Japan, Hiroshima )
For more information, a H-bomb ( Hydrogen bomb ) is more explosive ( the sun is made mostly by Hydrogen ) and North Korea declared that they just have one.

Which statement explains why the bonds between nonmetals tend to be covalent? The bonds are found to be nondirectional. They have large differences in electronegativity. They have small differences in electronegativity. They have ions that produce an electrostatic pull.

Answers

Correct Answer: They have small differences in electronegativity (statement 3)
Reason:
The nature of chemical bond between atoms is primarily driven by the electronegativity difference between constituent atoms. If electronegativity difference between constituent atoms is significantly higher, ionic bond formation is preferred. On other hand, low difference in electronegativity values, favours formation of covalent bond.

Helen is standing in the hallway with her friend Janet, next to Helen's locker. Each girl has a body mass of 48 kilograms (kg), and thus each exerts a force of 470.4 Newtons (N) on the hall floor. What is the total force, in Newtons (N), that the hall floor exerts on the pair of girls?A. 940.8 N
B. 96 N
C. 960.4 N
D. 48 N

Answers

The right answer for the question that is being asked and shown above is that: "A. 940.8 N." Helen is standing in the hallway with her friend Janet, next to Helen's locker. Each girl has a body mass of 48 kilograms (kg), and thus each exerts a force of 470.4 Newtons (N) on the hall floor.

Supply the volume of insoluble substance from the displaced liquid Displaced liquid: 274 ml

Volume: ? L

Answers

1 L ----------- 1000 mL
? ------------- 274 mL

L = 274 * 1 / 1000

= 0.274 L

hope this helps!

What is the role of the judicial branch?to interpret laws
to write laws
to execute laws
to lead the military

Answers

Answer:

to interpret laws

Explanation:

Answer:

To Interpet Laws

Explanation:

What is the energy change that will occur when 25.5 grams of oxygen gas (O2) react with excess methane (CH4) according to the reaction below? CH4 + 2 O2yields CO2 + 2 H2O delta H = -889 kJ/mol

Select one:
a. 354 kJ of energy will be given off by the reaction
b. 354 kJ of energy will be absorbed by the reaction
c. 708 kJ of energy will be given off by the reaction
d. 708 kJ of energy will be absorbed by the reaction

Answers

amount of CH4 is excess, so no need to worry about it
but the limiting factor is the Oxygen

according to stranded equation,

CH4 + 2 O2 --> CO2 + 2 H2O ΔH = -889 kJ/mol

just by taking proportions

(-889 kJ/mol) / 2 x 0.8 mol = - 355.6 kJ

so i think the answer is (a)

Other Questions

Based on the law of Conservation of Mass, what happens to the mass of a substance in a chemical change? A: the mass is always conserved B: The mass is either created or destroyed C: the reactant always has more mass D: the product always has more mass

Who is regarded as father of modern chemistry ?

Creates clouds, snow, sleet, rain and hail

Complete the following Empirical Formula & Molecular Formula problem:2.) A compound containing C and Cl has a molar mass of 284.77 g/mol and an empirical formula of CCl.