A sample of gas at 23°C has a volume of 10 L and exerts a pressure of 640 mm Hg. How many moles of gas are in the sample?
8.28 mol
3.47 mol
77.4 mol
0.347 mol
Chemistry?
2018-08-24 7:20 am
回答 (1)
2018-08-24 8:27 am
✔ 最佳答案
Temperature, T = (273 + 23) K = 296 KVolume, V = 10 L
Pressure, P = 640/760 atm
Gas constant, R = 0.08206 atm L / (mol K)
Gas law: PV = nRT
No. of moles, n = PV/(RT) = (640/760) × (10) / (0.08206 × 296) mol = 0.347 mol
Answer: 0.347 mol
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