We will use ideal gas equation for each questions;
PV = nRT
Where P is pressure in atm, V is volume in liters, n is moles, R is gas constant and T is temperature in Kelvin.
Moles (n) = mass / molar mass
1)
PV = nRT
n = PV / RT = 0.9531*0.06421 / 0.083145 * (22.3+273)
n = 0.002492 moles ....Answer
2)
T = PV/nR = 121.7*4.137 / 0.01937*62.364
T = 416.785 K ...Answer
3)
V = nRT/P = 1 * 0.082057 * (273-191) / 0.315
V = 21.36 liters ...Answers
4) this can be calculated in same way as above
5)
n = PV/RT = 155*180/0.082057*(25+273)
n = 1140.965 moles
Mass of Helium = moles * molar mass = 1140.965 * 4 = 4563.86 grams ...Answer
Let me know if any doubts/answer is not matching.
You may use any of the following values of the ideal gas constant R to solve...
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