(a) State two factors which can affect the rate of a chemical reaction.

(b) 0.72g of magnesium was added to different volumes of 2 mol. per dm\(^3\) hydrochloric acid. The volume of liberated was as measured at room temperature and pressure. The result of the experiment was as tabulated

vol. of 2 mol. per dm\(^3\) HCl used (cm\(^3\)

Vol. of H\(_2\) evolved in cm\(^3\) (to the nearest 10cm\(^3\))

120

360

550

600

Use the data in the table to plot a graph of the volume of hydrogen liberated against the volume of acid used.

(c) From the graph in (b) above, determine the volume of: (i) hydrogen that would be produced if 50 cm\(^3\) of the acid were added to 0.72g of magnesium.

(ii) the acid which must be added to 0.72 g of magnesium to produce 480 cm\(^3\) of hydrogen;

(iii) the acid needed exactly to dissolve 0.72 g of magnesium completely.

(d) Explain your answer to (c)(iii).

(e) From your answers to (c) above, deduce the: (i) volume of the acid which will dissolve 1 mole of magnesium completely. (Mg = 24)

(ii) volume of hydrogen that would be liberated if 1 mole of magnesium dissolves completely in the acid;

(iii) equation for the reaction between magnesium and hydrochloric acid. Show clearly how you arrived at you answers

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