Question

the heat reaction c+1/2o2=co at 17 c and at constant volume is -29.29 kcal calculate the heat of reaction at constant pressure

Answer 1

ans is.......

-29.00

I think this is the right answer!!!!!

Answer 2

The heat of reaction at constant pressure is -29 kcal.

Explanation :

The given chemical reaction is:

$C(graphite)+\frac{1}{2}O_2(g)\rightarrow CO(g)$

Formula used:

$\Delta H=\Delta E+\Delta n_g RT$

where,

$\Delta H$ = heat of reaction at constant pressure

$\Delta E$ = heat of reaction at constant volume = -29.29 kcal

$\Delta n_g$ = change in gaseous moles = Product - Reactant = $1-\frac{1}{2}=\frac{1}{2}$

T = temperature = $17^oC=17+273=290K$

R = gas constant = 2 Cal = 2 × 10³⁻ kcal/K

Now put all the given values in the above formula, we get:

$\Delta H=-29.29 kcal+\frac{1}{2}\times 2\times 10^{-3}kCal/K\times 290K$

$\Delta H=-29kcal$

Therefore, the heat of reaction at constant pressure is -29 kcal.

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