For the reaction shown calculate how many grams of oxygen form when each quantity of the reactant completes reacts. 2HgO(s) 2Hg(l)+ O2(g) 1.65 kg hgo

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decomposition reaction.

molar mass of HgO is 200.6 +16 =216.6

2HgO2Hg + O2(g)

1.65 kg HgO = 1650gm/216.6=

7.62 moles )

2 moles of HgO gives 1 mole of O2

7.62 moles gives 3.81 moles O2

molar mass O2=32

3.81 moles of O2=3.81 X 32 =121.92 gm O2 released

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3. c) iron and nickel.