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Consider the following equation:

4B(s) + 3O2 (g) → 2B2O3 (s)

ΔH = - 2509.1 kJ

How much heat (in kJ) is transferred when 989 mg of B2O3 (s) is formed?

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Now you're answer mooching. I showed you how to do this type question under Amanda. You get more help when you don't change screen names.
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