Chemistry

Problem

Heat of formation of

\text{H}_2\text{O}(\text{g})

25^\circ\text{C}

-243 \text{ KJ}

\Delta U

for the reaction

\text{H}_2(\text{g}) + \frac{1}{2}\text{O}_2(\text{g}) \rightarrow \text{H}_2\text{O}(\text{g})

25^\circ\text{C}

is :- (1)

241.8 \text{ KJ}

(2)

-241.8 \text{ KJ}

(3)

-243 \text{ KJ}

(4)

243 \text{ KJ}