A 130.9 gram sample of an unknown substance (MM = 189.50 g/mol) is cooled from 233.0 °C to 147.6 °C. (heat capacity of liquid = 1.62 J/g. °C; heat capacity of gas = 1.04 J/g °C; AHvap = 78.11 kJ/mol; normal boiling point, Tb = 160.3 °C) How much energy (in kJ) is absorbed/released to cool the gas?

Chemistry: The Molecular Science
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Author:John W. Moore, Conrad L. Stanitski
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Chapter4: Energy And Chemical Reactions
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A 130.9 gram sample of an unknown substance (MM = 189.50 g/mol)
is cooled from 233.0 °C to 147.6 °C. (heat capacity of liquid = 1.62
J/g. °C; heat capacity of gas = 1.04 J/g∙ °C; AHvap = 78.11 kJ/mol;
normal boiling point, Tb = 160.3 °C)
How much energy (in kJ) is absorbed/released to cool the gas?
+
Transcribed Image Text:A 130.9 gram sample of an unknown substance (MM = 189.50 g/mol) is cooled from 233.0 °C to 147.6 °C. (heat capacity of liquid = 1.62 J/g. °C; heat capacity of gas = 1.04 J/g∙ °C; AHvap = 78.11 kJ/mol; normal boiling point, Tb = 160.3 °C) How much energy (in kJ) is absorbed/released to cool the gas? +
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