After the label fell off a bottle containing a clear liquid believedto be benzene, a chemist measured the density of theliquid to verify its identity. A 25.0-mL portion of the liquidhad a mass of 21.95 g. A chemistry handbook lists the densityof benzene at 15 °C as 0.8787 g>mL. Is the calculated densityin agreement with the tabulated value?
Thermochemistry
Thermochemistry can be considered as a branch of thermodynamics that deals with the connections between warmth, work, and various types of energy, formed because of different synthetic and actual cycles. Thermochemistry describes the energy changes that occur as a result of reactions or chemical changes in a substance.
Exergonic Reaction
The term exergonic is derived from the Greek word in which ‘ergon’ means work and exergonic means ‘work outside’. Exergonic reactions releases work energy. Exergonic reactions are different from exothermic reactions, the one that releases only heat energy during the course of the reaction. So, exothermic reaction is one type of exergonic reaction. Exergonic reaction releases work energy in different forms like heat, light or sound. For example, a glow stick releases light making that an exergonic reaction and not an exothermic reaction since no heat is released. Even endothermic reactions at very high temperature are exergonic.
After the label fell off a bottle containing a clear liquid believed
to be benzene, a chemist measured the density of the
liquid to verify its identity. A 25.0-mL portion of the liquid
had a mass of 21.95 g. A chemistry handbook lists the density
of benzene at 15 °C as 0.8787 g>mL. Is the calculated density
in agreement with the tabulated value?
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