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A 0.250-g sample of a magnesium-aluminum alloy dissolves completely in an excess of HCl(aq). When the liberated H2(g) is collected over water at 29 ?C and 752 torr, the volume is found to be 311 mL. The vapor pressure of water at 29 ?C is 30.0 torr.
balanced equation: Mg(s)+2HCl(aq)→MgCl(subscript)2(aq)+H(subscript)2(g)
The molar mass of Al is 26.98 g/mol.
Express your answer in terms of y to four decimal places (i.e., 0.5000y).
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