The vapor pressure of pure ethyl bromide at this, Ask an Expert

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At 21.0 °C, a solution of 26.55 g of a nonvolatile, nonpolar compound in 30.87 g of ethylbromide, C2H5Br, had a vapor pressure of 319.2 torr. The vapor pressure of pure ethyl bromide at this temperature is 400.0 torr. Assuming an ideal solution, what is the molecular mass of the compound?

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