Question

Calculate the molar mass of 5.43). At STP, 0.280 L of a gas weight 0.400g. Calculate the molar mass of the gas.
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Answer 1

Given:

• V=0.280 L.

• Mass of the gas=0.400g.

• Temperature=273K

• PV=nRT

• n=PV/RT

         =1*0.280 L/0.0821*273

         =0.0124moles.

• Molar mass of the gas=Mass of the gas/n

                                          =0.400/0.0124=32.26g

Therefore, molar mass of the gas is approximately 32.26g.

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