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Chemistry NCERT Exemplar Solutions Class 12th Chapter Three States of Matter Ncert Solutions Chemistry Class 11th Chemistry Class 11th

For combustion of one mole of magnesium in an open container at 300 K and1 bar pressure, $Δ_{C} H^{Θ} = - 601.70 k J m o l^{- 1},$ the magnitude of change in internal energy for the reaction is__________ kJ. (Nearest integer)

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alok kumar singh | Contributor-Level 10

2 months ago

For combustion of Mg:

Mg (s) + $\frac{1}{2} O_{2} (g) \to M g O (s)$

Here, $Δ n g = - \frac{1}{2}$

Now using

$Δ H = Δ U + Δ n g R T$

-601.7 = $Δ U + (- \frac{1}{2}) \times 8.3 \times 1 0^{- 3} \times 300$

$Δ U = - 600.45 k J$

So; magnitude of $Δ U$ is 600 kJ (the nearest integer).

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For combustion of one mole of magnesium in an open container at 300 K and1 bar pressure, $Δ_{C} H^{Θ} = - 601.70 k J m o l^{- 1},$ the magnitude of change in internal energy for the reaction is__________ kJ. (Nearest integer)

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For combustion of one mole of magnesium in an open container at 300 K and1 bar pressure, Δ C H Θ = − 6 0 1 . 7 0 k J m o l − 1 , the magnitude of change in internal energy for the reaction is__________ kJ. (Nearest integer)

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For combustion of one mole of magnesium in an open container at 300 K and1 bar pressure, $Δ_{C} H^{Θ} = - 601.70 k J m o l^{- 1},$ the magnitude of change in internal energy for the reaction is__________ kJ. (Nearest integer)