Author Question: How much energy must be removed from a 125 g sample of benzene (molar mass = 78.11 g mol-1) at 425.0 ... (Read 70 times)

shenderson6 · **on:** Nov 18, 2019

Question 1

How much energy is required to heat 36.0 g H2O from a liquid at 65 °C to a gas at 115 °C? The following physical data may be useful:

ΔvapH = 40.7 kJ mol-1
Cliq = 4.18 J g-1 °C-1
Cgas = 2.01 J g-1 °C-1
Csol = 2.09 J g-1 °C-1
Tmelting = 0 ∘C
Tboiling = 100 ∘C

◦ 10.9 kJ
◦ 87.7 kJ
◦ 63.5 kJ
◦ 91.7 kJ
◦ 52.7 kJ

Question 2

How much energy must be removed from a 125 g sample of benzene (molar mass = 78.11 g mol-1) at 425.0 K to liquify the sample and lower the temperature to 335.0 K? The following physical data may be useful:

ΔvapH = 33.9 kJ mol-1
ΔfusH = 9.8 kJ mol-1
Cliq = 1.73 J g-1 °C-1
Cgas = 1.06 J g-1 °C-1
Csol = 1.51 J g-1 °C-1
Tmelting = 279.0 K
Tboiling = 353.0 K

◦ 38.9 kJ
◦ 67.7 kJ
◦ 95.4 kJ
◦ 54.3 kJ
◦ 74.4 kJ

sylvia · **Reply #1 on:** Nov 18, 2019

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