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40L of a gas at STP have a mass of 20.0 g. The mass of one mole of this gas is __________. (Molar volume of 1 mole of a gas at STP is 22.4L

Sagot :

[tex] \frac{20.0g}{40L} \frac{22.4L}{1mol} [/tex] = 11.2g/mol

The mass of one mole of this gas is 11.2g .