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Calculate the molar mass of 20 L of gas weighing 23.2 g at STP.

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Calculate the molar mass of 20 L of gas weighing 23.2 g at STP.

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Molar mass = (Weigh of the substance x Molar volume) / (Volume of the substance at STP)

Molar volume at STP = 2.24 x 10-2 m3 = 22.4 L (or) 22400 cc. 

Molar mass of the gas at STP = (23.2 x 22.4)/ 20 = 25.984 g.

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