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(a)

Fig. 7.1 summarises the respiration of an organic substance, A, in aerobic conditions.

[ 3 ]
(i)

Complete Fig. 7.1 in the spaces provided.

C18H32O2 substance A+……….O2⟶……..CO2+16H2O\underset{\text { substance } A}{\mathrm{C}_{18} \mathrm{H}_{32} \mathrm{O}_{2}}+\ldots \ldots \ldots . \mathrm{O}_{2} \longrightarrow \ldots \ldots . . \mathrm{CO}_{2}+16 \mathrm{H}_{2} \mathrm{O}
[ 2 ]
(ii)

Calculate the RQ for substance A.

Write your answer to two decimal places.

RQ =
[ 1 ]
(a)

The respiratory quotient, RQ, is used to show which substrate is being metabolised by cells. It can be determined using the equation below.

RQ= molecules of carbon dioxide released  molecules of oxygen taken in \mathrm{RQ}=\frac{\text { molecules of carbon dioxide released }}{\text { molecules of oxygen taken in }}

Lauric acid is a saturated fatty acid found in coconuts and has a chain of 12 carbon atoms.

(i)

Calculate the RQ value for lauric acid.

Show your working. Give your answer to 2 decimal places.
answer =

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