Chemistry · 2020
JEE Main · 2 September 2020, Shift 1 · Q46
The internal energy change (in J) when 90 g of water undergoes complete evaporation at 100°C is \ \ \ \. (Given: Δ H_vap for water at 373 K =41 kJ /…
The internal energy change (in J) when $\displaystyle 90$ g of water undergoes complete evaporation at $\displaystyle 100$°C is \_\_\_\_. (Given : $\displaystyle \Delta \mathrm{H}_{\text {vap }}$ for water at $\displaystyle 373 \mathrm{~K}=41 \mathrm{~kJ} /$ $\displaystyle \mathrm{mol}, \mathrm{R}=8.314 \mathrm{JK}^{-1} \mathrm{~mol}^{-1}$ )
Official answer
189500 ± 500
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