Homework Help: chemistry

Posted by Brit on Tuesday, November 27, 2012 at 4:43pm.

A 1.70 g sample of a certain metal reacts with acid to liberate 380 mL of hydrogen gas, when collected over water at 20 Celsius and over 720 torr. What is the equivalent mass of the metal?

chemistry - DrBob222, Tuesday, November 27, 2012 at 5:23pm
M + 2HX ==> MX + H2
mols H2 = n
P = (720-vapor pressure H2O @ 20C)/760 atm
T = 273+ 20
V = 0.380 L
R = 0.08206 L*atm/mol*K
Solve for n.
Then mol = grams/molar mass and solve for molar mass.
Equivalent mass = molar mass/valence.

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