Xg of a pure sample of iron (II) sulphide reacted completely with excess dilute hydrochloric acid to give 3.20g of iron (II) chloride according to the following equation: FeS${}_{(s)}$ + 2HCI${}_{(aq)}$ ---> FeCl${}_{2(aq)}$ + H${}_2$S${}_{(g)}$.
(a) Mention one method apart from heating by which the reaction can be made to proceed faster
(b) Calculate the value of X. [CI = 35.5, Fe = 56; FeS = 88g mol${}^{-1}$]


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