Answer:
The number of moles of zinc nitrate in 145 g of zinc nitrate, Zn(NO₃)₂, is 0.767 moles
Note: The question made an error of saying miles instead of moles
Explanation:
To determine the number of moles that are in 145 g of zinc nitrate;
First the molar mass of Zinc nitrate is determined, where the atomic masses of the elements in zinc nitrate,Zn(NO₃)₂, are given as: Zn = 65 g/mol, N = 14 g/mol, O = 16 g/mol
Molar mass of zinc nitrate, Zn(NO₃)₂ = 65 + (14 + 16 × 3) × 2 = 189 g/mol
Using the formula, number of moles = mass/molar mass
Number of moles in 145 g of zinc nitrate = 145/189
Number of moles in 145 g of zinc nitrate = 0.767 moles
Therefore, the number of moles of zinc nitrate in 145 g of zinc nitrate, Zn(NO₃)₂, is 0.767 moles
