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Chemistry HW?
How many joules of energy are needed to change 138 g of water at 12.8°C to steam at 100°C?
2 Answers
- ChemTeamLv 77 years ago
Two calculations:
1) heat water from 12.8 c to 100.0 C ---> use specific heat of liquid water
2) boil water at 100 C ---> use heat of fusion
q1 = (138 g) (87.2 C) (4.184 J/g C)
q2 = (6.02 kJ/mol) (138 g / 18.0 g/mol)
q1 will be in J and q2 will be in kJ. Change J to kJ and add the two values for the final answer.
