Which of the following is not an example of heterogeneous catalysis?     a) 2O3(g) → 3O2(g) has a catalyst of Cl(g) b) CO(g) + 3H2(g) → CH4(g)+H2O(g) has a catalyst of Co(s) c) C2H4(g) + H2(g) → C2H6(g) has a catalyst of Ni(s) d) 2CO(g) + 2NO(g) → 2CO2(g)+N2(g) has a catalyst Rh(s)

If methylisonitrile is placed in a sealed quartz tube and heated in a tube furnace, it isomerizes to acetonitrile according to the reaction below:   CH3NC (g)  →  CH3CN (g)   The sealed tube initially contains 0.200 mol of methylisonitrile and zero moles of acetonitrile.  After about 25 minutes of heating, there is 0.108 mol of methylisonitrile remaining in the tube.  Please calculate the average rate of decomposition of methyisonitrile during this 25 min. period.     Question 3 options:   A)  3.7×10-3 mol/min   B)  0.092 mol/min   C)  4.3×10-3 mol/min   D)  2.3 mol/min   E)  0.54 mol/min

topic: molecular collision reactions A student reacts ground chalk, CaCO3(s), with HCl(aq) in an open beaker at room temperature. Explain, using collision theory, what happens to the rate of the reaction as the reaction proceeds to completion.