Question

Given the reaction, H2 + Cl2 → 2HCl, if 12.0 moles of HCl were made, then how many moles of H2 were used?

24.0 moles


12.0 moles


6.00 moles


3.00 moles

Answer 1

C

Step-by-step explanation:

Balance the equation

It is balanced.

Put the known number of moles under the HCl

H2 + Cl2 → 2HCl

12

Put an x under the desired unknown.

H2 + Cl2 → 2HCl

x 12

Set up a proportion

1/x = 2/12

Solve

Cross multiply

2x = 1 * 12

2x = 12 Divide by 2

2x/2 = 12/2

x = 6

The answer is C