21Which statement concerning relative rates of reaction is correct for the decomposition of phosphine?4 PH3(g) → P4(g) H2(g)a) The rate of disappearance of PH3 is 6/4 the rate of appearance of H2.b) The rate of appearance of P4 is equal to the rate of appearance of H2.c) The rate of disappearance of PH3 is 1/4 the rate of appearance of P4.d) The rate of disappearance of PH3 is 4 times the rate of appearance of H2.e) The rate of appearance of H2 is 6 times the rate of appearance of P4.
63Ozone decomposes to oxygen according to the balanced chemical equation below.2 O3(g) → 3 O2(g)If the rate of disappearance of ozone is -7.2 10-4 M/s, what is the rate of formation of oxygen?a) 4.8 10-4 M/s b) 7.2 10-4 M/s c) 1.1 10-3 M/s d) 1.4 10-3 M/s e) 2.2 10-3 M/s
84Which of the following changes are likely to increase the rate of a chemical reaction?1. Adding a catalyst2. Increasing the temperature of the reactants3. Increasing the concentrations of the reactantsa) 1 only b) 2 only c) 3 only d) 1 and e) 1, 2, and 3
126 What is the overall order of the reaction below 2 NO(g) H2(g) → N2(g) H2O(g)if it proceeds via the following rate expression?a) zero-order b) first-order c) second-order d) third-order e) fourth-order