chem questions

1. According to the ideal gas law, a 0.9150 mol sample of nitrogen gas in a 1.753 L container at 265.8 K should exert a pressure of 11.38 atm. By what percent does the pressure calculated using the van der Waals’ equation differ from the ideal pressure? For N2 gas, a = 1.390 L2atm/mol2 and b = 3.910E-2 L/mol.

2. Aluminum reacts with aqueous sodium hydroxide to produce hydrogen gas according to the following equation:

2Al(s) + 2NaOH(aq) + 6H2O(l)—>2NaAl(OH)4(aq) + 3H2(g)

The product gas, H2, is collected over water at a temperature of 25 °C and a pressure of 759 mm Hg. If the wet H2 gas formed occupies a volume of 7.01 L, the number of moles of Al reacted was _____ mol. The vapor pressure of water is 23.8 mm Hg at 25 °C.

3. Calcium carbide reacts with water to produce acetylene gas according to the following equation:

CaC2(s) + 2H2O(l)—>C2H2(g) + Ca(OH)2(aq)

The product gas, C2H2, is collected over water at a temperature of 20 °C and a pressure of 743 mm Hg. If the wet C2H2 gas formed occupies a volume of 9.86 L, the number of grams of C2H2 formed is ____ g. The vapor pressure of water is 17.5 mm Hg at 20 °C.

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