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The vapor pressure of pure methanol (CH3OH, 32.0 g/mol) is 75.4 torr at 12.0 oC. If...

The vapor pressure of pure methanol (CH3OH, 32.0 g/mol) is 75.4 torr at 12.0 oC. If 0.400 mol of a nonvolatile solute is added to 320. g CH3OH, what is the vapor pressure of the solution, reported to three significant figures?

The answer is 72.5 torr but im not sure how to get there.

I need a step by step please

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