Mole-Mass calculation

Question

Can someone please explain how to solve this problem in detail. Thank you so much!

 

What mass of hydrogen can be produced by reacting 6.0 mol of aluminum with hydrochloric acid? The balanced equation is 

2 Al (s) + 6 HCL (aq) --> 2 AlCl3 (aq) + H2(g).

Answer 1

Hi Beatrice!  

 

You are given the moles of Al and asked to solve for mass (grams or kg) of H2 gas.

 

First, use the coefficients of the balanced chemical equation to calculate moles of H2 produced:

 

6 mol Al (1 mol H2/2 mole Al) = 3 mol H2

 

Second, use the molar mass of H2 to convert moles of H2 to mass of H2:

 

3 mol H2 (2.014 g/mol H2) = 6.04 g of H2

 

 

If you have any further questions about this problem, please contact me.

 

Carol