A. How many joules of energy are needed to change 10.0 grams of solid H2O to liquid H20? (Heat of Fusion = 335 J/g, Molar Mass of H20 = 18.02 grams or amu)
- 10.0 grams x 335 J / 18.02 g of H2O = 186 J (Rounded Answer according to specified amount of significant numbers).
B. Naphthalene has a heat fusion of 35.7 cal/g and a molar mass of 128.0 g/mol. How much heat in Kcal is required to melt 0.568 moles of naphthalene?
- O.568 mol Naphthalene x 128.0 grams / 1 mol Naphthalene x 35.7 cal / 1 gram of Naphthalene x 1 Kcal / 1000 cal = 2.60 Kcal (Rounded to specified amount of significant numbers).
- Thanks to all who responded!
- 10.0 grams x 335 J / 18.02 g of H2O = 186 J (Rounded Answer according to specified amount of significant numbers).
B. Naphthalene has a heat fusion of 35.7 cal/g and a molar mass of 128.0 g/mol. How much heat in Kcal is required to melt 0.568 moles of naphthalene?
- O.568 mol Naphthalene x 128.0 grams / 1 mol Naphthalene x 35.7 cal / 1 gram of Naphthalene x 1 Kcal / 1000 cal = 2.60 Kcal (Rounded to specified amount of significant numbers).
- Thanks to all who responded!