Questions asked by shirles92

Questions asked by shirles92

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I understand the top half, and got the same answer (1.20M) but I don't know how they figured out the molarity for Ca2+ and 2Cl- Can someone help clarify this?
2AL $(s)$ $(s)$ + 6HCL $3 (a q)$ $3(aq)$ $\to$ $rarr$ 2AlCl $3 (a q)$ $3(aq)$ + 3H $2 (g)$ $2(g)$ 0.040 mol piece of aluminium reacted completely in 20s. the rate of formation of hydrogen gas is?