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Heat of formation of CO2 is 94.0 K.cal. ...

Heat of formation of `CO_2` is 94.0 K.cal. What would be thequantity of heat liberated, when 3g of graphite, is burnt in excess of oxygen

A

23.5 K cals

B

2.35 K cals

C

94.0 K cals

D

31.3 K cals

Text Solution

Verified by Experts

The correct Answer is:
A
`C_((s))+O_(2(g))rarr CO_(2) , Delta H_(f)(CO_(2))`
or `Delta H_("comb.")(C )=-94` KCal
1 mole = 12g liberates 94 KCal heat
`therefore` 3g C liberates `=(94)/(12)xx3=23.5 KCal`
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ALLEN-THERMODYNAMICS -EXERCISE -3
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  2. Which of the following equations corresponds to the enthalpy of combus...

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  3. Heat of formation of CO2 is 94.0 K.cal. What would be thequantity of h...

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  4. The amount of heat liberated when one mole of NH(4)OH reacts with one ...

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  5. If H^(+)+OH^(-)to H(2)O(l)+13.7 Kcal, then the value of heat of neutra...

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  6. The heat of neutralisation of a strong dibasic acid in dilute solution...

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  7. The temperature of a 5mL of strong acid increases by 5^(@) when 5 mL o...

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  8. The enthalpy of neutralisation of HCl by NaOH IS -55.9 kJ and that of...

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  9. If water is formed from H and OH^(-) ions then the enthalpy of formati...

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  10. The change in the enthalpy of NaOH+HCl rarr NaCl+H(2)O is called :

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  11. Heat of neutralisation of oxalic acid is -106.7 KJ mol^(-1) using NaOH...

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  12. The heat of combustion of C2H4 C2H6 and H2 are- 1409.5 kJ,- 1558.3kJ a...

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  13. The enthalpy of combustion of H(2), cyclohexene (C(6)H(10)) and cycloh...

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  14. Bond energy of a molecule :

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  15. Among the following for which reaction heat of reaction represents bon...

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  16. The bond energies of F2 Cl2, Br2 and I2 are 155.4, 243.6, 193.2 and 15...

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  17. Energy required to dissociate 4 g of gaseous hydrogen into free gaseou...

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  18. Heat evolved in the reaction H(2)[g]+Cl(2)[g] rarr 2HCl[g] is 182 kJ...

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  19. The enthalpy change for the reaction H(2)(g)+C(2)H(4)(g)rarr C(2)H(6)(...

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  20. Bond dissociation enthalpies of H(2)(g) and N(2)(g) are 436.0 kJ mol^(...

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