Question

Calculate the amount of heat needed to boil 156. g of methanol (CH3OH), beginning from a temperature of 0.8 °C. Be sure your answer has a unit symbol and the correct number of significant digits. 0 x10

Answer 1

Methanol boiling point = 64.6 °C

initial temperature = 0.8 °C

specific heat capacity = 2.53

Q = mcΔT = 156.g x 2.533 J/g.°C x (64.6 - 0.8)

Q = 25210 J = 252 x 10² J

now to boil, heat of vaporization = 35.21 kJ/mol

moles methanol = 156 g / 32.04 g/mol = 4.86891385768 mol

Q = 4.86891385768 mol x 35.21 kJ/mol = 171.434456929 kJ = 171434 J

Total heat required = 171434 J + 25180 J = 196614 J = 197 x 10³ J

Answer: 197 x 10³ J

Calculate the amount of heat needed to boil 156. g of methanol (CH3OH), beginning from a temperature of 0.8 °C. Be sure your answer has a unit symbol and the correct number of significant digits. 3 10 0 197 J

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