Chemistry Help!!

Determine triangle H when 10g of HN3 are reacted in the following reaction:
4HN3 + 2NO2 arrow pointing > 2H202 + 7N2

(note: triangle Hf for HN3 = +267.1 kJ

Equation?
Answer?
Thanks

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  1. 4 x molar mass HN3 = ?? approximately 43.

    So 267.1 kJ is needed for 43 g HN3. What you need for 10 g?

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