Suppose a saturated solution of this solute was made using 63.0 g H2O at 20.0 °C. How much more solute can be added if the temperature is increased to 30.0 ∘C? g

Which of the following statements is true? a. most heat energy is easily recovered and used for useful actions. b. friction causes molecules to vibrate more slowly. burning air and gasoline in an c. engine changes chemical energy into mechanical energy. it is impossible to d. change mechanical energy into mechanical energy.