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it was easy , thanks!a(i) from the curve ( and also the table given below) 96.5%
(ii)fully saturated means 100%, so by unitary method,
%age : vol. of O2
100 : 1.3
96.5 : x
x = (96.5 * 1.3 )/ 100 = 1.25 cm^3
b(i) 24%
(ii) again the method above, vol. of O2= (24 * 1.3)/100 = 0.312 cm^3