A sample of gas has a mass of 0.570 g . Its volume is 126 mL at a temperature of 75 ∘C and a pressure of 763 mmHg .
Find the molar mass of the gas.
11.72 MASTERING CHEMISTRY?
2016-10-14 6:12 am
回答 (3)
2016-10-14 6:45 am
✔ 最佳答案
Mass, m = 0.570 gVolume, V = 126 mL = 0.126 L
Absolute temperature, T = (273 + 75) K = 348 K
Pressure, P = 763/760 atm
Gas constant, R = 0.0821 atm L / (mol K)
Molar mass, M = ? g/mol
PV = nRT and n = m/M
Then, PV = (m/M)RT
Hence, M = mRT/(PV)
Molar mass, M = 0.570 × 0.0821 × 348 / [(763/760) × 0.126] g/mol = 129 g/mol
(to 3 sig. fig.)
2016-10-14 6:14 am
Megan, do you have a formula for this? Try Ideal Gas Law
One mole of an ideal gas will occupy a volume of 22.4 liters at STP (Standard Temperature and Pressure, 0°C and one atmosphere pressure).
One mole of an ideal gas will occupy a volume of 22.4 liters at STP (Standard Temperature and Pressure, 0°C and one atmosphere pressure).
2016-10-14 6:15 am
Use n = PV/RT to find moles. Then Molar mass = mass / moles
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