7.5g of calcium carbonate was placed in a conical flask containing 50cm³ of dilute hydrochloric acid. The flask kept at constant temperature and the volume of carbon (IV) oxide gas evolved was measured at 20 minutes intervals. Not all the calcium carbonate was used up during the reaction the results were recorded in the table below

Time from start of reaction ( minutes)	Volume of Co2 evolved cm3
0	0
20	555
40	810
60	695
80	1000
120	1020

(a) Write an equation for the reaction between calcium carbonate and hydrochloric acid ( 1 mk)

(b) Plot a graph volume of carbon (IV) oxide produced against time (minutes)

( 3 mks)

(c) What volume of carbon (IV) oxide were evolved during the 20^th minutes intervals (20- 40) minutes ( 1 mk)

(d) Why was there no increase in volume of the gas evolved after 100 minutes? ( 1 mk)

(e) Calculate the mass of 11. 2 cm³ of carbon (IV) oxide gas evolved at stp: molar gas volume = 22.4 dm³

(f) Determine the mass of calcium carbonate which had reacted after 120 minutes ( 1 mk)