For the reaction 4A(g) + 3B(g) 2C(g) tl1e following data were obtained at constant temperat 11re:

Question

Experiment

Initial Rate ( mol/L·min)

Initial [A ] (mol/L)

Initial [B] (mol/ L)

1 5.00 0.100 0.100

2 45.0 0.300 0.100

3 10.0 0.100 0.200

4 90.0 0.300 0.200

is the answer of A will be:

A: first, second, third, fourth, zero

is the answer of B will be:

B: first, second, third, fourth, zero

Answer 1

Compare exp. 1 and 2:

[A] triples while [B] remains constant. Rate increases by a factor of 9 times (45/5). This makes the reaction 2nd order in A

Compare exp. 1 and 3:

[B] doubles while [A] remains constant. Rate increases by a factor of 2 times (10/5). This makes the reaction 1st order in B