Use Hess's Law to calculate the enthalpy change for the reaction WO3(s) + 3H2(g) ---> W(s) + 3H2O(g) from the following data: 2W(s) + 3O2(g) ---> 2WO3(s) DH = –1685.4 kJ 2H2(g) + O2(g) ---> 2H2O(g) DH = –477.84 kJ

24. a sports ball is inflated to an internal pressure of 1.85 atm at room temperature (25 °c). if the ball is then played with outside where the temperature is 7.5 °c, what will be the new pressure of the ball? assume the ball does not change in volume nor does any air leak from the ball a) 0.555 atm b) 1.74 atm c) 1.85 atm d) 1.97 atm