MOLAR ENTHALPY OF WAX:
The formula for the candle wax is C25H52
and the accepted value for the heat of combustion is 15MJ / mol.
Assumption is heat given off by candle = heat
captured in the water.
heat captured in water = (4.184 J/g-degC)(1750 g)(24-21)degC
= 22000 Joules
Now find moles of candle burned.
mass burned = 5.88-5.24 = 0.64 g
molar mass of C25H52 = 353 g/mol
moles wax burned = 1.8 x 10^-3 mol
Then convert to heat per mole:
Heat per mole = 22000 J/1.8 x 10^-3 mol = 12,000,000 J/mol
OR
,( 12 MJ/mol)
Initial mass of candle: 5.88g
Final mass of the candle=5.24g
initial temperature of the water=21
final temperature of the water=24
mass of the water =1.75L
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