Chemistry relevent
What is the enthalpy of the overall chemical reaction mc014-2.jpg?
-1,300 kJ
What is mc032-1.jpgGsystem for the system that is described by the following data? mc032-2.jpgHsystem = -345 kJ, T = 293 K, mc032-3.jpgSsystem = 465 J/K mc032-4.jpgGsystem = mc032-5.jpgHsystem - Tmc032-6.jpgSsystem
-481 kJ
The molar heat of fusion for water is 6.01 kJ/mol. How much energy is released when 36.8 g of water freezes at its freezing point?
12.3 kJ
The molar heat of fusion of gold is 12.550 kJ mol-1. At its melting point, how much mass of melted gold must solidify to release 235.0 kJ of energy?
3,688.3 g
According to the enthalpy diagram below, which of the following statements is true?
CArrow C indicates that the third intermediate reaction is exothermic.
Which energy change takes place when gasoline evaporates from a fuel gas can?
Energy is absorbed.
Which energy changes are associated with a liquid freezing?
Energy is released as potential energy decreases.
What is the definition of entropy?
a measure of the overall disorder of a system
Which type of reaction is always spontaneous?
an exothermic reaction that has an increase in disorder
mc020-2.jpgH = 98.8 kJ, and mc020-3.jpgS = 141.5 J/K. Is this reaction spontaneous or nonspontaneous at high and low temperatures?
spontaneous at high temperatures, nonspontaneous at low temperatures
The overall change in enthalpy of a reaction depends only on
the reactants and the products.
According to Hess's law, if a series of intermediate reactions are combined, the enthalpy change of the overall reaction is
the sum of the enthalpy changes of the intermediate reactions.
