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Given
P
\[
\begin{array}{l}
\mathrm{H}_{2}(\mathrm{~g})+1 / 2 \mathrm{O}_{2}(\mathrm{~g}) \rightarrow \mathrm{H}_{2} \mathrm{O}(\mathrm{g})+\mathrm{q}_{1} \\
\mathrm{H}_{2}(\mathrm{~g})+1 / 2 \mathrm{O}_{2}(\mathrm{~g}) \rightarrow \mathrm{H}_{2} \mathrm{O}(\mathrm{l})+\mathrm{q}_{2}
\end{array}
\]
W
The enthalpy of vaporisation of water is equal to
(1) \( q_{1}+q_{2} \)
(2) \( q_{1}-q_{2} \)
(3) \( \mathrm{q}_{2}-\mathrm{q}_{1} \)
(4) \( \mathrm{q}_{1} \mathrm{q}_{2} \)
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