First slide

Enthalpy of solution & dilution

Question

$A (s) + 20 moles H_{2} O \to A (in 20 moles H_{2} O); ΔH = - 72 kJ$
$A (s) + 40 moles H_{2} O \to A (in 40 moles H_{2} O); ΔH = - 81 kJ$
Enthapy of dilution when a solution containing one mole of A in 20 moles $H_{2} O$ is diluted by adding 20 moles of $H_{2} O$ to it will be

Easy

Solution

Equation (2) – Equation (1)
$ΔH = - 9 kJ$
$∵$ The reaction is exothermic with increase in dilution exothermic nature increases.

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