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  • Consider the following reactions: (i) <img alt="H^{+}_{(aq)}+OH^{-}_{(aq)}= H_2O_{(l)}," src="https://entrancecorner.oncodecogs.com/gif.latex?H%5E%7B&plus;%7D_%7B%28aq%29%7D&

Consider the following reactions:

(i) H^{+}_{(aq)}+OH^{-}_{(aq)}= H_2O_{(l)},

\Delta H=-X_1\, \, \, kJmol^{-1}

 

(ii) H_2_(g_) +\frac{1}{2}O_2_(g_)= H_2O_(l_)

\Delta H= -X_2\, \, kJmol^{-1}

 

(iii) CO_2_(g_) +H_2_(g_)= CO_(g_) +H_2O,

\Delta H=-X_3\: \: kJmol^{-1}

 

(iv) C_2H_2_(g_) +\frac{5}{2}O_2_(g_)= 2CO_2_(g_)+ H_2O_(l_)

\Delta H= +X_4\: \: kJmol^{-1}

 

Enthalpy of formation of H_2O_(l_) is

 

Option: 1

+X_3\: \: kJmol^{-1}


Option: 2

-X_4\: \: kJmol^{-1}


Option: 3

+X_1\: \: kJmol^{-1}


Option: 4

-X_2\: \: kJmol^{-1}


Answers (1)

Enthalpy of formation is the amount of heat required during the formation of 1 mole of a compound from its constituent elements.

Option (4) is answer.

Posted by

Ramraj Saini

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