February 20, 2017

Homework Help: chemistry

Posted by Blain on Wednesday, April 13, 2011 at 6:28am.

for this question
How many liters of H2 gas at STP are produced
when Zn reacts with 125 mL of 6.00 M HCl?

my book answers it this way:

0.125 L x 6.00 mole HCl x 1 mole H2 x 22.4 L
1 L 2 mole HCl 1 mole

= 8.40 L of H2 gas
where did the 22.4L come from?

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