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Author Question: How much energy must be removed from a 94.4 g sample of benzene (molar mass = 78.11 g mol-1) at ... (Read 309 times)

formula1

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Question 1

How much energy is required to heat 87.1 g acetone (molar mass = 58.08 g mol-1) from a solid at -154.0 °C to a liquid at -42. 0°C? The following physical data may be useful:

ΔfusH = 7.27 kJ mol-1
Cliq = 2.16 J g-1 °C-1
Cgas = 1.29 J g-1 °C-1
Csol = 1.65 J g-1 °C-1
Tmelting = -95.0 °C

◦ 8.48 kJ
◦ 32.2 kJ
◦ 9.97 kJ
◦ 29.4 kJ
◦ 18.5 kJ

Question 2

How much energy must be removed from a 94.4 g sample of benzene (molar mass = 78.11 g mol-1) at 322.0 K to solidify the sample and lower the temperature to 205.0 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

◦ 70.2 kJ
◦ 17.6 kJ
◦ 10.5 kJ
◦ 11.8 kJ
◦ 29.4 kJ


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Marked as best answer by formula1 on Nov 18, 2019

HandsomeMarc

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