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7. Nickel replaces silver from silver nitrate in solution according to the following equation:
2AgNO3 + Ni (arrow) 2Ag +Ni(NO3)2
a. If you have 22.9 g of Ni and 112 f of AgNO3, which reactant is in excess?
b. What mass of nickel(II) nitrate would be produced given the quantities above?

15. Sulfur dioxide can be produced in the laboratory by the reaction of hydrochloric acid and a sulfite salt such as sodium sulfite.
Na2SO3 +2HCl (arrow) 2NaCl + SO2 +H2O
What mass of SO2 can be made from 25.0 g of Na2SO3 and 22.0 g of HCl?

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Solution Preview

7. 2AgNO3 + Ni -> 2Ag +Ni(NO3)2
According to this reaction: 2 moles of AgNO3 will react with 1 mole of Ni. You need the molecular weights of them:
Molecular weight AgNO3 = 108+14+3*16=170(g/mol)
Molecular weight Ni = 59 (g/mol)

Now calculate the number of moles of these reactants:
Number of mole of Ni ...

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