"βthe hydrolysis of 1 dm3 of a 1moldm-3
solution releases 30500j of energy...β¦β¦β¦β¦." Assuming this solution (in bold) is a solution containing ATP, then let us go step by step, OK?
30500 joules of energy corresponds to one mole of ATP (there is one mole of ATP in 1 dm3 of a 1M (1 Molar) solution of ATP (info given).
So how much is 40% (not lost as heat) of this? Of course, 30500 X 0.4 =
12200 joules is given by one mole of ATP, yeah?OK next step:-
They tell you that 0.05 cm3 of soln was used - so how much ATP in it?
Yes do it bit by bit...β¦β¦β¦β¦β¦ well done! 0.05 cm3 = 0.05/1000 dm3 = 5 X 10-5 dm3
Conc-n given = 8 X 10-6 M
So, actual MOLES of ATP in it = (8 X 10-6) X (5 X 10-5) = 40 X 10-11 =
4 X 10-10 molesLast step:
FROM italics above,
one mole of ATP gives 12200 joules of energy
So how much will underlined amount give?
YES: 4 X 10-10 X 12200 = 12.2 X 4 X 10-7 = 48.8 X 10-7 joules =
4.88 X 10-6 joules (ANSWER).Hope this is correct!
M (specialist biology tutor)