# दिया गया है: _ C(ग्रेफाइट)+O2(g)→CO2(g),ΔrH∘=−393.5kJmol−1 H2(g)+12O2(g)→H2O(I),ΔrH∘=−285.8kJmol−1 CO2(g)+2H2O(I)→CH4(g)+2O2(g),ΔrH∘=+890.3kJmol−1 उपरोक्त ऊष्मरासायनिक समीकरणों के आधार पर, K पर, निम्नलिखित अभिक्रिया के लिए ΔrH∘ का मान होगा: C(ग्रेफाइट)+2H2(g)→CH4(g)

A

+144.0kJmol1

B

74.8kJmol1

C

144.0kJmol1

D

+74.8kJmol1

Text Solution
Verified by Experts

## अभिक्रिया के लिए CO2(g)+2H2O(I)→CH4(g)+2O2(g) ΔrH∘=Σ(ΔfH∘)उत्पाद−Σ(ΔfH∘)अभिकारक =[(ΔrH∘(CH4)+2×0)+890.3=[ΔfH∘(CH4)]−[−393.5+2×(−285.8)] CH4(g) का ΔfH∘=−74.8KJ/mol

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Updated on:21/07/2023

### Knowledge Check

• Question 1 - Select One

## Given Cgraphite+O2(g)→CO2(g),ΔrH∘=−393.5kJmol−1 H2(g)+12O2(g)→H2O(l),ΔrH∘=−285.8kJmol−1 CO2(g)+2H2O(l)→CH4(g)+2O2(g),ΔrH∘=+890.3kJmol−1 Based on the above thermochemical equations, the value of ΔrH∘ at 298 K for the reaction C(graphite)+2H2(g)→CH4(g) will be :

A+144.0kJmol1
B74.8kJmol1
C144.0kJmol1
D+74.0kJmol1
• Question 2 - Select One

## Given Cgraphite+O2(g)→CO2(g),ΔrH∘=−393.5kJmol−1 H2(g)+12O2(g)→H2O(l),ΔH∘=−285.8kJmol−1 CO2(g)+2H2O(l)→CH4(g)+2O2(g),ΔH∘=+890.3kJmol−1 Based on the above thermochemical equations, the value of ΔH∘ at 298 K for the reaction Cgraphite+2H2(g)→CH4(g) will be :

A+748kJ
B+144.0kJ
C74.8kJ
D144.0kJ
• Question 3 - Select One

## Given: C(Graphite)+O2(g)→CO2(g),ΔrH∘=−393.5kJmol−1<br>H2(g)+12O2(g)→H2O(l),ΔrH∘=−285.8kJmol−1 CO2(g)+2H2O(l)→CH4(g)+2O2(g),ΔrH∘=+890.3kJmol−1 Based on the above thermochemical equations, the value of ΔrH∘ at 298 K for the reaction C(graphite)+2H2(g)→CH4(g) will be _________ .

A+74.8kJmol1
B+144.0kJmol1
C74.8kJmol1
D144.0kJmol1

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