Chemistry question about moles?

Abby

New member
2B +6HCl --> 2BCl3 + 3H2

How many moles of hydrogen gas are made when 6.26 moles of boron are allowed to react with an unlimited amount of HCl ? (Round to 3 significant figures.)
A) 3.77E+24
B) 6.05
C) 3.00
D) 9.39
E) 4.17
 
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