IIT JEE , AIEEE Forum - Chemistry , Physical Chemistry

ashrivastava777

Given that

C +O2 -------> CO2 delta H = -X KJ

2CO2 ---------> 2CO2 delta H = -Y KJ

Enthalpy of formation of CO will be

a) Y-2X

b) 2X-Y/2

c) Y-2X/2

d) 2X-Y

a_JOSHI

i think its d coz u twice the first one and add it to the second one...
rate please if correct

ashrivastava777

hey i did't got ur ans. plz explain me?

dream

where is CO in the reaction????

none of the two given reactions have CO forming
theres some typing error i think!!!!!!!!!!!

and second main to CO2 giving CO2
what sense does it make???

ashrivastava777

hey d question is rite....................................

allamraju

The enthalpy of formation shud be found for the reaction

C+1/2O₂CO.This can be obtained by 1st reaction-1/2the 2nd reaction.So,the ans is optionB that is 2X-Y/2.

asish

pls even write if any states(change) r there
if no state change 2nd rxn makes no sense

allamraju

The second reaction must be 2CO+O₂2CO₂.It may be a typo mistake.Atleast i think so and hence posted the above solution.

asish

then ur answer is absolutely correct allamraju

it is the 2nd option

dream

thats what i was expecting as second equation!!!!!!!

krishna.gopal

See 2CO2 --> 2CO2 is no reaction. There is same mistake. WIth Allamaraju's equation his answer is right.

ashrivastava777

but d ans is 3rd means Y-2X/2

shubhamranker

i think q is not corret because here is not any information about co

Ask & Discuss Questions with Community & Experts

C+1/2O2CO.This can be obtained by 1st reaction-1/2the 2nd reaction.So,the ans is optionB that is 2X-Y/2.

The second reaction must be 2CO+O22CO2.It may be a typo mistake.Atleast i think so and hence posted the above solution.

C+1/2O₂CO.This can be obtained by 1st reaction-1/2the 2nd reaction.So,the ans is optionB that is 2X-Y/2.

The second reaction must be 2CO+O₂2CO₂.It may be a typo mistake.Atleast i think so and hence posted the above solution.