The vapor pressure of water at 29 circ rm c is 30.0 rm, Ask an Expert

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A 0.250-rm g sample of a magnesium-aluminum alloy dissolves completely in an excess of rm HCl(aq). When the liberated rm H_2(g) is collected over water at 29 ^circ rm C and 752 rm torr, the volume is found to be 343 mL. The vapor pressure of water at 29 ^circ rm C is 30.0 rm torr. What is the mass percentage of aluminum in this alloy?

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