ThermochemistryHard

Question

Given that

C(s) + O2(g) → CO2(g); ΔHo = −X kJ

2CO(g) + O2(g) → 2CO2(g): ΔHo = −Y kJ

The enthalpy of formation of carbon monoxide will be

Options

A.(2X − Y)/2
B.(Y − 2X)/2
C.2X − Y
D.Y − 2X

Solution

$C(s) + O_{2}(g) \rightarrow CO_{2}(g);\Delta H^{o} = - x\text{ KJ}$

$- \frac{1}{2} \times \left\lbrack 2CO(g) + O_{2}(g) \rightarrow 2CO_{2}(g);\Delta H^{o} = - y\text{ kJ} \right\rbrack$

___________________________________________________

$C(s) + \frac{1}{2}O_{2}(g) \rightarrow CO(g);\Delta H^{o} = ( - x) - \frac{1}{2}( - y) = \frac{y - 2x}{2}$

Create a free account to view solution

View Solution Free
Topic: Thermochemistry·Practice all Thermochemistry questions

More Thermochemistry Questions

Enthalpy change for the reaction,4H(g) → 2H2 (g) is - 869.6 kJ The dissociation energy of H - H bond is...The heat capacity of bomb calorimeter is 500 J/°C. A 2°C rise in temperature has been observed on the combustion of 0.1 ...The bond enthalpies of C–C, C=C and C≡C bonds are 348, 610 and 835 kJ/mol, respectively at 298 K and 1 bar. The enthalpy...Enthalpies of combustion of CH4, C2H6 and C3H8 are −210, −370 and −526 kcal/mol, respectively. Enthalpy of combustion of...The enthalpy change when x g of phenol dissolves in y g of CHCl3 is given below at a certain temperature.x Y ΔH (kcal)0....