Final answer:
To find the number of moles in 72g of magnesium, divide the mass by the molar mass of magnesium (24.305 g/mol), which yields approximately 2.96 moles.
Step-by-step explanation:
To calculate the number of moles in 72g of magnesium, we use the formula:
Number of moles = Mass of the substance (g) / Molar mass of the substance (g/mol)
The molar mass of magnesium (Mg) is approximately 24.305 g/mol. Therefore, the calculation would be:
Number of moles = 72 g / 24.305 g/mol ≈ 2.96 moles
So, there are approximately 2.96 moles of magnesium in a 72g sample.
To calculate the number of moles in a sample, you need to use the formula:
moles = mass / molar mass.
For magnesium (Mg), the molar mass is approximately 24.305 g/mol.
So, to find the number of moles in 72g of magnesium:
moles = 72g / 24.305 g/mol = 2.96 moles.