Calculate the amount of H2 produced from the reaction of 4.25 grams Zn and 25 ml of 3.0 M HCL.

Answer 1

This is a limiting reagent (LR) problem.
Zn + 2HCl ==> H2 + ZnCl2

mols Zn = grams/atomic mass = ?
mols HCl = M x L = ?

Using the coefficients in the balanced equation, convert mols Zn to mols H2.
Do the same to convert mols HCl to mols H2.
More than likely the two values for mols H2 produced will not be the same which means one of the values is not right. The correct value in LR problems is ALWAYS the smaller one and the reagent producing that value is the LR.

Take the smaller value of mols H2 produced and convert it to grams. g H2 = mols H2 x molar mass H2.

Answer 2

What was wrong with the solution I posted on this same problem? => Tuesday, April 18, 2017 at 9:35pm