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In: Chemistry

Calculate ΔHrxn for the following reaction: CH4(g)+2O2(g)→CO2(g)+2H2O(l) Use the following reactions and given ΔH values. CH4(g)+O2(g)→CH2O(g)+H2O(g),...

Calculate ΔHrxn for the following reaction:

CH4(g)+2O2(g)→CO2(g)+2H2O(l)


Use the following reactions and given ΔH values.

CH4(g)+O2(g)→CH2O(g)+H2O(g), ΔH=−284 kJ
CH2O(g)+O2(g)→CO2(g)+H2O(g), ΔH=−527 kJ
H2O(l)→H2O(g), ΔH= 44.0 kJ

Please, provide thorough explanation

Solutions

Expert Solution

CH4(g)+O2(g)→CH2O(g)+H2O(g), ΔH=−284 kJ -------------> 1
CH2O(g)+O2(g)→CO2(g)+H2O(g), ΔH=−527 kJ --------------> 2
H2O(l)→H2O(g), ΔH= 44.0 kJ ------------->3

adding 1 and 2 equations

CH4(g)+O2(g)→CH2O(g)+H2O(g),    ΔH=−284 kJ -------------> 1
CH2O(g)+O2(g)→CO2(g)+H2O(g),    ΔH=−527 kJ --------------> 2

-----------------------------------------------------------------------------------------------------------

CH4(g) + 2O2(g) ---------> CO2 (g) + 2H2O(g)     ΔH   = -811KJ

2H2O(l) ------------------------> 2H2O (g)                ΔH   = 88KJ       substact

(-)                                         (-)                                       (-)

------------------------------------------------------------------------------------------------------------

CH4(g)+2O2(g)--------------------> CO2(g)+2H2O(l)      ΔH    = -899KJ

queen_honey_blossom answered 2 years ago
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