Step One
Find the moles of HCl
C = 1.0 mol/L
V = 75 mL = 75 / 1000 = 0.75 L
Note the concentration is in Liters.
Formula
n = C*V
Solve
n = 1.0 * 0.075
n = 0.075 moles
Step two
Adjust the number of moles of HCl
How every mol of H2 produced, you will require 2 mol of HCl
[tex] \frac{2 mol HCl}{1 mol H_2} = \frac{0.075\text{mol of HCl given}}{x} [/tex]
2/1 = 0.075/x Cross multiply
2x = 0.075 Divide by 2
x = 0.075 / 2
x = 0.0375 moles of H2 <<<<<<<<< Answer
