Sig figs.

[Shack05]

Looking at q2.c.ii of 2009 paper
the examiner's report gives it to 2 s.f (9.1x10^-6)
I thought it should have been to three, does the fact that it is log to the base 10 mean it is 2 sig figs lol?

[jasoN-]

Yes my thoughts too.
It should be 3 sig figs, unless they ridiculously used the sig figs on the enthalpy value of part (a) (completely irrelevant)

[crayolé]

Is any calculation involving combustion of alkanes/alkanols 2 sig figs because of the hydrogen in the molar mass?

[Edmund]

Looking at q2.c.ii of 2009 paper
the examiner's report gives it to 2 s.f (9.1x10^-6)
I thought it should have been to three, does the fact that it is log to the base 10 mean it is 2 sig figs lol?

Yeah you should round it off to 3 sig figs.

Is any calculation involving combustion of alkanes/alkanols 2 sig figs because of the hydrogen in the molar mass?

Not really, you need to round off your answer to the least sig figs according to data given.