-1142 kJ
-571 kJ
+1142 kJ
-1713 kJ
Correct answer is D
2H2 + O22 → H2+O ΔH = -571kJ
4.0g of Hydrogen burn in air to produce -571 kJ
∴ 12.0s of Hydrogen will burn in air to produce
(12 * -571)/4 = -1713kJ
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