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A 0.250-g sample of a magnesium-aluminum alloy dissolves completely in an excess of HCl(aq). When the...

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 305 mL . The vapor pressure of water at 29 ∘C is 30.0 torr.

a. Taking into account the vapor pressure of water, how many moles of hydrogen gas, n, are present in 305 mL at 752 torr and 29 ∘C? The value of the gas constant R is 0.08206 L⋅atm/(mol⋅K). You may also find the conversion factors1 atm=760 torr and TK=TC+273 useful. Express the number of moles to three significant figures.

b. What is the mass percentage of aluminum in this alloy? Express your answer numerically.

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queen_honey_blossom answered 2 years ago
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