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)# + 6HCL#3(aq)# #rarr# 2AlCl#3(aq)# + 3H#2(g)# 0.040 mol piece of aluminium reacted completely in 20s. the rate of formation of hydrogen gas is?