87 What is the change in enthalpy (in kJ) under standard conditions when 246.4 g of sodium...

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Chemistry

87
What is the change in enthalpy (in kJ) under standard conditionswhen 246.4 g of sodium sulfate dissolves in water?
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4.3 Ratings (836 Votes)

answer : -2413.6 kJ

Na2SO4 molar mass = 142 g / mol

Na2SO4 weight = 246.4 g

Na2SO4 moles = 246.4 / 142

Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â = 1.74

for 1 mole Na2SO4 dissoves in water the change in enthalpy = -1387.1 kJ

for 1.74 mole Na2SO4 dissoves in water the change in enthalpy = -1.74 x 1387.1 kJ

Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â = -2413.6 kJ

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