JEE MAIN - Chemistry (2018 - 15th April Morning Slot - No. 22)
For which of the following reactions, $$\Delta $$H is equal to $$\Delta $$U?
N2(g) + 3H2(g) $$ \to $$ 2NH3(g)
2HI(g) $$ \to $$ H2(g) + I2(g)
2NO2(g) $$ \to $$ N2O4(g)
2SO2(g) + O2(g) $$ \to $$ 2SO3(g)
Explanation
$$\Delta $$H = $$\Delta $$$$\mu $$ + $$\Delta $$ng RT
$$\therefore\,\,\,$$ $$\Delta $$H = $$\Delta $$$$\mu $$
When, $$\Delta $$ng RT = 0
$$ \Rightarrow $$ $$\Delta $$ng = 0
For this reaction,
2HI(g) $$ \to $$ H2 (g) + I2 (g)
$$\Delta $$ng = (1 + 1) $$-$$ 2 = 0
$$\therefore$$ $$\Delta $$H = $$\Delta $$$$\mu $$
$$\therefore\,\,\,$$ $$\Delta $$H = $$\Delta $$$$\mu $$
When, $$\Delta $$ng RT = 0
$$ \Rightarrow $$ $$\Delta $$ng = 0
For this reaction,
2HI(g) $$ \to $$ H2 (g) + I2 (g)
$$\Delta $$ng = (1 + 1) $$-$$ 2 = 0
$$\therefore$$ $$\Delta $$H = $$\Delta $$$$\mu $$
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