balanced combustion reaction for C6H6

Question

Equation: 2C₆H₆(l)+15O₂(g)--> 12CO₂+6H₂O(l)_6542 KJ

 

If 5.900g of C6H6 is burned and the heat from the burning is added to 5691g of water at 21 degrees Celsius, what is the final temperature of the water? 

Answer 1

Heat = 5.900 g (1 mol/78.1118g)(654200J/2 mol) = 494100

 

494100J = (5691g)(4.184 J/g deg)(t - 21)

 

t = 41.8 deg C