Question

calculate the amount of heat released when 5.00 g of H2O2 is decomposed ( at constant pressure) in accordance with the following reaction : 2H2O2(l)->2H2O(l)+ O2(g) ∆H=-196kJ
​

Answer 1

Answer:

2H

2

O

2

(l)→2H

2

O(l)+O

2

(g)

ΔH=2×Δ

f

H

(H

2

O(l))

+Δ

f

H

(O

2

(g))

−2×Δ

f

H

(H

2

O

2

(l))

=2×(−286)+0−2×(−188)

=2(−286+188)

=2×(−98)

=−196 kJ/mol

Explanation:

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