Final answer:
To calculate the number of moles of atoms in a given mass, divide the mass by the molar mass. For example, 32.7 g of Zn is equal to 0.5 mol.
Step-by-step explanation:
To calculate the number of moles of atoms contained in a given mass, we need to use the formula:
Number of moles = mass (g) / molar mass (g/mol)
For (a) 32.7 g Zn:
Number of moles = 32.7 g / 65.4 g/mol
(molar mass of Zn) = 0.5 mol
Similarly, for (b) 7.09 g Cl:
Number of moles = 7.09 g / 35.5 g/mol
(molar mass of Cl) = 0.2 mol
For (c) 95.4 g Cu:
Number of moles = 95.4 g / 63.5 g/mol
(molar mass of Cu) = 1.5 mol
For (d) 4.31 g Fe:
Number of moles = 4.31 g / 55.8 g/mol
(molar mass of Fe) = 0.08 mol
Lastly, for (e) 0.378 g S:
Number of moles = 0.378 g / 32.1 g/mol
(molar mass of S) = 0.01 mol