A 0.250- g <?xml:namespace prefix = v ns = \"urn:schemas-microsoft-com:vml\" />

Question

A 0.250- g<?xml:namespace prefix = v ns = "urn:schemas-microsoft-com:vml" /> <?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /> 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 degre celciusand 752 torr, the volume is found to be 325 ml . The vapor pressure of water at 29 degre celcius is 30.0 torr .

A)    How many moles of H2 can be produced from x grams of Mgin magnesium-aluminum alloy? The molar mass of Mgis 24.31 g/mol

B )How many moles of H2 can be produced from y grams of Al in magnesium-aluminum alloy? The molar mass of Al is 26.98 g/mol.

Explanation / Answer

1) Mg + 2 HCl ? MgCl2 + H2
(x g Mg) / (24.31 g Mg/mol) x (1/1) = 0.0411x

2) 2 Al + 6 HCl = 2 AlCl3 + 3 H2
(y g Al) / (26.98 g Al/mol) x (3/2) = 0.0556y

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