For which one of the following reactions,$\Delta H$ is not equal to $\Delta E$?

  • A
    $H_{2(g)} + I_{2(g)} \rightleftharpoons 2HI_{(g)}$
  • B
    $C_{(s)} + O_{2(g)} \rightleftharpoons CO_{2(g)}$
  • C
    $N_{2(g)} + 3H_{2(g)} \rightleftharpoons 2NH_{3(g)}$
  • D
    $HCl_{(aq)} + NaOH_{(aq)} \rightleftharpoons NaCl_{(aq)} + H_2O_{(l)}$

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$A$ $5 \, L$ cylinder contains $10 \, mol$ of $O_2$ gas at $27 \, ^\circ C$. Due to a leak,the gas escapes into the atmosphere until the pressure inside the cylinder equals the atmospheric pressure $(1.0 \, atm)$. What is the work done by the gas?

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For the reversible isothermal expansion of $1 \, \text{mol}$ of an ideal gas at $300 \, K$ from a volume of $10 \, dm^3$ to $20 \, dm^3$,the value of $\Delta H$ in $kJ$ is:

$A$ gas is allowed to expand against a constant external pressure of $2.5 \ bar$ from an initial volume '$x$' $L$ to a final volume of $4.5 \ L$. If the amount of work done is $5 \ dm^3 \ bar$,what is the value of '$x$' (in $L$)?

Consider the following reaction:
$CO_{(g)} + 1/2 O_{2_{(g)}} \to CO_{2_{(g)}}$
How are $\Delta E$ and $\Delta H$ related for the reaction?

Under which of the following conditions is the relation $\Delta H = \Delta E + P \Delta V$ valid for a closed system?

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