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The standard enthalpies of formation of ...

The standard enthalpies of formation of `CO_(2)` gas and `HCOOH_((l))` are -393.7 kJ `mol^(-1) and -409.2 kJ mol^(-1)` respectively. Which of the following are correct?

A

`C_((s)) + O_(2(g)) rarr CO_(2(g)), Delta H = - 393.7 kJ mol^(-1)`

B

`CO_(2(g)) + H_(2(g)) rarr HCOOh_((l)) , Delta H = - 15.5 kJ mol^(-1)`

C

`H_(2)O_((l)) + CO_((g)) rarr HCOOH_((l)) , Delta H = - 409.2 kJ mol^(-1)`

D

`C_((s)) + H_(2(g)) + O_(2(g)) rarr H_(2)CO_(2(l)), Delta H = - 409.2 kJ mol^(-1)`

Text Solution

Verified by Experts

The correct Answer is:
A, B, D
`C + O_(2) rarr CO_(2), Delta H_(1) = - 393.7`
`C + H_(2) + O_(2) rarr HCOOH, Delta H_(2) = - 409.2`
`H_(2)CO_(2) rarr HCOOH`
`Delta H = Delta H_(2) - Delta H_(1) = - 15.5KJ`
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