The mass of one formula unit of SrCl2 is 158.52 amu. Based on this fact, what conclusion can you draw?

A. A mole of SrCl2 particles has a mass of 158.52 g.

B. 1 g of SrCl2 contains an average of 158.52 particles.

C. A mole of SrCl2 contains an average of 158.52 particles.

D. The mass of one SrCl2 particle is 158.52 g.

The answer is the option A. "A mole of SrCl2 particles has a mass of 158.52 g".

The mass of one formula unit of a compound is the mass in grams of one mole of partilces with such formula.

For example, the mass of 1 mole of CH4 is the mass of one formula unit of CH4.

The formula unit is calculated adding up the atomic masses of each atom that is is the formula multiplied by the amount of that atom in the formula.

In the case of SrCl2 you use 1 * the atomic mass of Sr + 2 * the atomic mass of Cl.

Remember that the atomic mass of an element is the mass of one mol of atoms of that element.