\textbf{217.} In a calorimeter where water is used instead of glycerin, 920 grams of glycerin are used. When this calorimeter is used under similar conditions, the temperature rises $620$ grams of ethylene glycol by $8^\circ\text{C}$. If the molar heat capacity of glycerin is equal to the molar heat capacity of ethylene glycol, and the specific heat capacity of ethylene glycol is $2/5\ \text{J.g}^{-1}.^\circ\text{C}^{-1}$, what is approximately the specific heat capacity of glycerin in $\text{J.g}^{-1}.^\circ\text{C}^{-1}$?
(Read the options from right to left.) $(H = 1,\ C = 12,\ O = 16 : \text{g.mol}^{-1})$
(1) $2/\!18\ ,\ 1/\!4$ \quad (2) $2/\!35\ ,\ 1/\!4$ \quad (3) $2/\!54\ ,\ 1/\!8$ \quad (4) $2/\!69\ ,\ 1/\!8$
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