Can someone answer these 5 chemistry questions???

Question

1. What is the equation for the ideal gas law?
2. List what each symbol stands for.
3. What is the value of R?


For 4 and 5, show your equation (symbols only, then your work with the numbers).
4. If 2.44 moles of Helium gas has a pressure of 2.4 atm at 343 K, what volume must the gas occupy?
5. If there are 6.25 L of Hydrogen gas at a pressure of 1.95 ATM and a temperature of 243 K, how many grams of hydrogen are there? (Hint: review assignment 4.8.)

Answer 1

pV=nRT

Answer 2

PV = nRT The value of R depends on the units of the other factors. For P in atm and V in liters, R = 0.082

4. V = nRT/P
V = (2.44mol)(0.082)(343K)/((2.4atm) = 28.6L

5. The problem asks for grams H2, but grams H2 is not part of the equation of state. The closest thing is moles H2, which can be turned into grams H2, 1 mol H2 = 2g H2.

n = PV/RT
n = (1.95atm)(6.25L)/(0.082)(243K) = 0.611molH2
0.611molH2 x 2gH2/1molH2 = 1.22gH2

In future, if the pressure is atm and volume is mL or cc of gas, the gas constant is 82.1 to three significant figures. If the pressure is in mmHg (millimeters of mercury) and the volume is liters, R is 62.4.

Do not be discouraged by disparaging comments of others. It can be confusing when the universal gas constant is not quite constant. Be encouraged by the original Lord Kelvin, who said that one cannot understand a thing unless one can calculate it.

Answer 3

1. \ pV = nRT

2.

\ p is the pressure [Pa],
\ V is the volume [m3],
\ n is the number of moles of gas [mol],
\ R is the gas constant
\ T is the temperature in kelvin [K].

3. 8.314472 [m3·Pa·K-1·mol-1]

don't know 4-5

Answer 4

Ideal gas law is:

(P1V1)/T1 = (P2V2)/T2


The pressure (P) times it's volume (V) divided by it's temperature (T) will be the same at two different time intervals. i.e. This will only work if one of the variables remains constant.

Answer 5

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