Help At STP, the pressure of a gas is torr; its temperature is degree C = K. The

Question

Help At STP, the pressure of a gas is torr; its temperature is degree C = K. The molar volume of a gas at STP is mL. If the initial conditions of gaseous system are: P_1, V_1, T_1 and its final conditions are P_2, V_2, T_2, the final volume(V_2) of the gas expressed in terms of V_1, P_1, T_1, P_2, and T_2 is When hydrogen gas is collected by displacement of water, there is always water vapor mixed with gaseous hydrogen. The partial pressure excreted by water vapor is called its vapor pressure and its numerical value depends on the of the gaseous mixture. Look up the vapor pressure of water vapor at 20 degree C in Appendix G. Its vapor pressure is torr. If the pressure of gas is 760 mm of water, its pressure is torr(mm of mercury).(the density of mercury is 13.6g/mL). The equivalent weight of a metal is that weight of the metal that will liberate 1.008 g of hydrogen gas(H_2) from an acid. However, 1.008 g of hydrogen is mol = mL at STP. The equivalent weight of aluminum is 9.0 g. The number of mols of hydrogen gas produced by the reaction between 2.00 g of Al and an acid is mol. The volume of liberated gas at STP is mL.

Explanation / Answer

1)
At STP,
Pressure = 760 torr
Temperature = 0 oC = 273.15 K

2)
The molar volume at STP is 22.4 L = 22400 mL

3)
use:
P1*V1/T1 = P2*V2/T2
V2 = (P1*V1*T2)/(P2*T1)

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