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The value of ΔH° for the reaction below is -1271 kJ:

2Ca (s) + O2
(g) → 2CaO (s)
How many kJ of heat are released when 17.00 g of CaO (s) is produced?

1 answer

I assume you mean 1271 kJ are released for 2 mols CaO or 2(40+16) = 112 g so 1271 kJ x (17.00/112) = ?
You should recalculate the molar mass of CaO and use twice that number as well as 4 significant figures for the final calculation.
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