uestion 5 of 11 ew Policies ow Attempt History urrent Attempt in Progress < > Incorrect. The second step takes place at constant T. Does this correspond to heating How many joules of energy are needed to change 174 g of water at 26.8°C to steam at 100°C Hint eTextbook and Media Save for Later J

s | PerodicC Table Equations The heat energy associated with a change in temperature that does not involve a change in phase is given by q = mC,AT where q is heat in joules, m is mass in grams, C, is specific heat in joules per gram per degree Celsius, Jg1°C-1 and AT is the temperature change in degrees Celsius. The heat energy associated with a change in phase at constant temperature is given by q= mApeH° where q is heat in joules, m is mass in grams, and ApcH° is the enthalpy of phase change in joules per gram. Physical constants The constants for H,O are shown here: • Specific heat of ice: Cs, ice = 2.09Jg1°C1 • Specific heat of liquid water: Cs, water = 4.18 Jg1°c-1 Enthalpy of fusion: Afus H° = 334 Jg • Enthalpy of vaporization: AvapH° =2250 J g1 • Part A How much heat energy, in kilojoules, is required to convert 39.0 g of ice at -18.0 °C to water at 25.0 °C? Express your answer to three significant figures and include the appropriate units. > View Available Hint(s) 32.80 kJ…

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Calculate the number of kilojoules of energy required to convert 30.0 grams of liquid ethanol initially at a temperature of -114.0°C to gas at 150.0°C. kj substance Ethanol Water DMSO t-Butanol formula C₂H5OH H₂O C₂H6SO C4H10O m.w. g/mol m.p. °℃ -114.0 0.0 46.069 18.015 78.129 19.0 74.123 25.2 b.p °℃ 78.0 100.0 189.0 82.4 AH fus kJ/mol 5.02 6.01 14.4 6.78 AHvap kJ/mol 38.6 40.67 48.6 39.1 Specific Heat Capacity Liquid J/g °C 2.30 4.184 1.96 2.9 Solid J/g °C 0.970 2.09 1.80 1.97 Gas J/g °C 1.94 1.84 1.20 1.73