Final answer:
To find the number of moles of MgS in 1.00 g, divide the mass by the molar mass of MgS (56.38 g/mol), resulting in approximately 0.0177 moles.
Step-by-step explanation:
To determine how many moles of MgS are in 1.00 g of MgS, we need to know the molar mass of MgS. Magnesium (Mg) has an atomic mass of approximately 24.31 g/mol, and sulfur (S) has an atomic mass of approximately 32.07 g/mol.
Adding these together, the molar mass of MgS is 24.31 g/mol + 32.07 g/mol = 56.38 g/mol.
Using the formula for number of moles:
Number of moles = mass (g) / molar mass (g/mol)
We get:
Number of moles of MgS = 1.00 g / 56.38 g/mol ≈ 0.0177 mol
So, there are approximately 0.0177 moles of MgS in 1.00 g of MgS.