MULTIPLE CHOICE. Choose the one alternative that best completes the statement or

Question

MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. The molecular weight of a gas is___g/mol if 6.7 g of the gas occupies 6.3 L at STP. The temperature of a simple of CH_4 gas(10 34 g) in a 50.0L vessel at 1 33 atm is___degreeC. A flask contains a mixture of lie and Ne at a total pressure of 2 6 atm. There are 2.0 mol of He and 5.0 mol of Ne in the flask. The partial pressure of He is___atm. A 0.133 mol sample of gas in a 525 mL container has a pressure of 312 torr. The temperature of the gas is__degreeC. A sample of a gas (1.50 mol) is contained in a 15 0L cylinder. The temperature is increased from 100degreeC to 150degreeC. The ratio of final pressure to initial pressure [P_2/P_1] is___. A sample of H_2 gas (20 L) at 3.5 atm was combined with 1.5 L of N_2 gas at 2.6 atm pressure at a constant temperature of 25 degreeC into a 7 0L flask. The total pressure in the flask is___atm. Assume the initial pressure in the flask

Explanation / Answer

At STP: Temperature is 298K, Pressure is 1atm.

The ideal gas equation states that PV=nRT, where n=mass/molecular weight.

Then PV=mRT/(m.w). And solving for m.w= mRT/PV

m.w= [(6.7g)(0.0821atmL/molK)(298K)] / [(1atm)(6.3L)] = 26.0192 g/mol.

The answer that best fits the statement is E) 27.

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