An experiment is done to determine the enthalpy of combustion of a fuel using a calorimeter containing water.
b = mass of fuel burned / g
w = mass of water heated / g
ΔT = temperature rise of water / K
M$_r$ = relative molecular mass of fuel
c = specific heat capacity of water / JK$^{-1}$ g$^{-1}$
Which expression gives the enthalpy of combustion (in J mol$^{-1}$), assuming there is no heat loss?
$ - \frac{{CW\Delta T{M_r}}}{b}$
2 )
$ - \frac{{Cb\Delta T{M_r}}}{W}$
3 )
$ - \frac{{cbw{M_r}}}{{\Delta T}}$
4 )
$ - \frac{{cbw\Delta T}}{{{M_r}}}$
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