Methane (ch4) effuses through a small opening in the side of a container at the rate of 1.30 × 10 8 mol s 1. an unknown gas effuses through the same opening at the rate of 5.42 × 10 9 mol s 1 when maintained at the same tem- perature and pressure as the methane. determine the molar mass of the unknown gas.

1. suppose a reaction mixture, when diluted with water, afforded 300 ml of an aqueous solution of 30 g of the reaction product malononitrile [ch2(cn)2], which is to be isolated by extraction with ether. the solubility of malononitrile in ether at room temperature is 20.0 g/100 ml, and in water is 13.3 g/100 ml. what weight of malononitrile would be recovered by extraction with (a) three 100-ml portions of ether and (b) one 300-ml portion of ether? suggestion: for each extraction, let x equal the weight extracted into the ether layer. in part (a), the concentration in the ether layer is x/100 and in the water layer is (30 x)/300; the ratio of these quantities is equal to k 20/13.3.

At 300 mm hg, a gas has a volume of 380 l, what is the volume at standard pressure

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