The mass of an iron (II) sulfate crystal is 8.36 g. How many moles of FeSO4 are in the crystal?

The number of moles present in the FeSO4 are 0.055 mol.

Explanation:

The mass of a substance containing the same number atoms in 12.0 g of 12C is known as mole. One mole of any substance is equal to 6.023 x 10^23. The moles of a substance can be determined by using the formula,

Number of moles = mass in grams / molecular mass

Given,

mass = 8.36 g,

molecular mass of FeSO4 = 151.908 g / mol

number of moles = 8.36 / 151.908

= 0.055 mol.