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

87

What is the change in enthalpy (in kJ) under standard conditions when 246.4 g of sodium sulfate dissolves in water?

Answer:

Expert Solution

answer : -2413.6 kJ

Na2SO4 molar mass = 142 g / mol

Na2SO4 weight = 246.4 g

Na2SO4 moles = 246.4 / 142

= 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

= -2413.6 kJ

queen_honey_blossom answered 1 year ago

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