Mcthyl alcohol and cthyl alcohol have vapour pressure cqual to 88.5 mm and 42.0 mm respectively at 45C. If 16.0 g of methanol and 46.0 g of ethanol are mixed at 45C, the mole fraction of methanol in the vapour is........(the mixture may be taken as ideal solution). (a) 0.467 (b) 0.502 (c) 0.513 (d) 0.556