By dissolving 5 g substance in 50 g of water, the decrease in freezing point is 1.2°C. The molal depression is 1.85°C. The molecular weight of substance is
137.2
118.2
105.4
154.2
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The density (in g mL–1) of a 3.60 M sulphuric acid solution that is 29% H2SO4 (molar mass = 98 g mol–1) by mass will be