Question

The enthalpy of formation of water from hydrogen and oxygen is-286.0Kj/mol. The enthalpy of decomposition of water into hydrogen and oxygen is

2 points

(a) -286.0 kj/mol

(b) -143.0kj/mol

(c)286.0kj/mol

(d)143.0kj/mol

pls ans as fast as u can pls pls​

Answer 1

Here is your answer:

Since, formation reaction is the reaction involving formation of 1 mole of that species from its constituent elements while decomposition reaction is breaking down of 1 mole of any species into its constituent species.

i.e for water

Formation reaction => H

2

+

2

1

O

2

→H

2

O

Decomposition reaction => H

2

O→H

2

+

2

1

O

2

Hence, the formation reaction and decomposition reaction are reverse reactions of each other.

Hence, the enthalpy of decomposition reaction will be negative of enthalpy of formation reaction i.e,

ΔH

d(H

2

O)

=−ΔH

f(H

2

O)

=−(−286.0)=286.0

Option c is correct answer.

Explanation:

I hope it helps you.

Mark me as branliest.

be happy.

Stay Safe Stay Healthy..