Question

How many grams of Ni are formed from 58.1 g of Ni₂O₃?

2 Ni₂O₃(s) ⟶ 4 Ni(s)+3O₂(g)

Step 1: Show the strategy for solving this problem.

grams Ni₂O₃ ⟶

grams Ni   moles Ni₂O₃   grams Ni₂O₃ 

moles O₂   moles Ni   grams O₂ 

Step 2 : Show the conversions required to solve this problem and calculate the grams of Ni.

165.38 g Ni₂O₃   1 mole Ni₂O₃   2 moles Ni₂O₃ 

32.00 g O₂   1 mole O₂   3 moles O₂   58.69 g Ni 

1 mole Ni   4 moles Ni 

Answer 1

Molar mass of Ni2O3,

MM = 2*MM(Ni) + 3*MM(O)

= 2*58.69 + 3*16.0

= 165.38 g/mol

Molar mass of Ni = 58.69 g/mol

Answer 2

It is 37.47 not 41.2Ni