2. Solve the following numerical problems involving data analysis: (a) 1.3 g of zinc powder is mixed with excess
dilute nitric acid. 480 cm of hydrogen gas is
collected in 10 s. Calculate the average rate
of reaction for the whole reaction in cm3s-
Time (s)
(b) The volume of oxygen gas released from
a mixture of hydrogen peroxide solution
0
and manganese(IV) oxide powder is
30
recorded at intervals of 30 seconds for
270 seconds in Table 4.1.
60
() Based on Table 4.1, draw a graph of
90
volume of oxygen gas against time.
(ii) Calculate the average rate of reaction:
120
• for the first 2 minutes
150
• in the second minute
• for the whole reaction
180
(ii) Calculate the rate of reaction:
210
• at the 60th second
240
• at the 150th second
• at the 240th second
270
28.50
33.00
36.50
39.00
40.00
40.00
40.00​