What is the final temperature of the solution when 4.806 g of sodium hydroxide is dissolved in 100.0 mL of water at an i...
What is the final temperature of the solution when 4.806 g of sodium hydroxide is dissolved in 100.0 mL of water at an initial temperature of 24.5 C?. The density of water is 0.9969 g/cm3, and the heat capacity is 4.184 J/C. The enthalpy of dissolution for sodium hydroxide is -44.2 kJ/mol.
Homework Answers
q = ms
mass of solution = mass of water + mass of sodium hydroxide
= (100*0.9969) + 4.806
= 104.496 g
moles of NaOH = 4.806/40
= 0.12015 moles
1 mole of NaOH gives heat energy -------> 44.2 KJ
0.12015 moles of NaOH gives heat energy ----> (44.2*0.12015)/1
= 5.31063 KJ
= 5310.63 J
5310.63 = 104.496 * 4.184*(T2 - 24.5)
T2 = 36.65 0C
final temperature of the solution = 36.65 0C
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