3. The purification of nickel from nickel ore is relatively simple chemically (s

Question

3. The purification of nickel from nickel ore is relatively simple chemically (stoichiometry) a) Nickel oxide is reacted with hydrogen to produce impure nickel metal. 600 g of nickel oxide is processed, with a yield of 85%. How much crude nickel is produced in this process? b) In the next step, the crude nickel is reacted with CO to produce a gaseous nickel The product from part a is treated by this process. If 350 g of Ni(CO) is produced, what is th yield of this reaction? compound. N? + CO ? Ni(CO)4

Explanation / Answer

(a)
Mass of NiO = 600 g.

Molar mass of NiO = 74.7 g/mol

Moles of NiO = mass / molar mass = 600 / 74.7 = 8.03 mol

From the balanced equation,

1 mol of NiO forms 1 mol Ni

Then, 8.03 mol NiO forms 8.03 mol of Ni

But % yield is only 85 %

So, moles of Ni Formed = 8.03 * 85 /100 = 6.83 mol of Ni

Mass of crude Ni formed = moles * molar mass = 6.83 * 58.7 = 401. g.

(b)

From the balanced equation,

1 mol of Ni forms 1 mol of Ni(CO)4

Then,

6.83 mol of Ni forms 6.83 mol of Ni(CO)4

Mass of Ni(CO)4 formed = moles * molar mass = 6.83 *170.7 = 1166 g.

% yield = 350 * 100 / 1166. = 30.0 %

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