How many moles are in a gas sample occupying 0.5000L at 170 mm Hg and 25 degree

Question

How many moles are in a gas sample occupying 0.5000L at 170 mm Hg and 25 degree C? a 0.00458 b. 0.00500 c. 2.18 d. 3.85 At standard conditions it was found that 2.24L of gas weighed 5.23 g. Its molecular mass a. 5.23 g b. 52.3 g c. 105 g d. 117g A sample of hydrogen is collected over water at a total pressure of 648 mm Hg at 22 degree C. The vapor pressure of water at 22 degree C is 19.8 mm Hg. The partial pressure of hydrogen is a. 1.00 atm b. 0.912 atm c. 0.853 atm d. 0.827 The equation below represents the complete combustion of ethane. C_2H_6(g) + O_2(g) rightarrow CO_2(g) + H_2O(g) At the same temperature and pressure, what is the maximum volume in liters of carbon dioxide that can be obtained from 15.9 L of C_2H_6 and 52.3 L of oxygen?

Explanation / Answer

13) Using formula

PV = nRT
n = PV / RT

= (170 mmHg) x (0.50 L) / ((62.36367 LmmHg/Kmol) x (25.0 + 273.15 K))

= 0.00457 mol

It is very close to option A hence option A is correct

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