2B + 3H2 2BH3
How many moles of BH3 are synthesized when 27.0 moles of H2 completely react?

18.0 moles of will be produced when 27.0 moles of completely react.

Explanation:

The balanced chemical equation is:

According to stoichiometry :

3 moles of produce = 2 moles of

Thus 27.0 moles of will produce=  of

Thus 18.0 moles of will be produced when 27.0 moles of completely react.

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