Hydrogen is burned according to the following chemical reaction: 2H2(g) + O2(g) → 2H2O(l) ∆Hrxn =...

Question

Question

Hydrogen is burned according to the following chemical reaction: 2H2(g) + O2(g) → 2H2O(l) ∆Hrxn = -286 kJ

Given 100 g of H2 and excess O2, how much heat is released?

Answer 1

Answer #1

According to the reaction,

2 mole H2 release 286 KJ heat

2×2 = 4 g H2 release 286 KJ heat

100 g H2 release 286×100/4 KJ heat

= 7150 KJ heat

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Answer 2

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