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.