The chemical formula for zinc nitrate is Zn(NO3)2. Calculate the molar mass of zinc nitrate. Round your answer to 1 decimal place. I g-mol x10 ? ?
The Correct Answer and Explanation is :
To calculate the molar mass of zinc nitrate, Zn(NO₃)₂, we need to sum the atomic masses of all atoms present in the compound. The atomic masses are approximately:
- Zinc (Zn): 65.38 g/mol
- Nitrogen (N): 14.01 g/mol
- Oxygen (O): 16.00 g/mol
In the formula Zn(NO₃)₂:
- There is 1 zinc atom.
- Each nitrate ion (NO₃) contains 1 nitrogen atom and 3 oxygen atoms.
- Since there are 2 nitrate ions, this amounts to 2 nitrogen atoms and 6 oxygen atoms.
The molar mass calculation is as follows:
Molar mass of Zn(NO₃)₂ = (1 × 65.38 g/mol) + (2 × 14.01 g/mol) + (6 × 16.00 g/mol)
Breaking it down:
- Zinc: 1 × 65.38 g/mol = 65.38 g/mol
- Nitrogen: 2 × 14.01 g/mol = 28.02 g/mol
- Oxygen: 6 × 16.00 g/mol = 96.00 g/mol
Adding these together:
65.38 g/mol + 28.02 g/mol + 96.00 g/mol = 189.40 g/mol
Rounded to one decimal place, the molar mass of zinc nitrate is 189.4 g/mol.
Understanding the molar mass is crucial in chemistry for stoichiometric calculations, which allow chemists to predict the amounts of reactants and products involved in chemical reactions. The molar mass serves as a conversion factor between the mass of a substance and the amount in moles, facilitating the quantification of substances in chemical equations.
For a visual explanation of this calculation, you can refer to the following video: