# What is the molecular mass of MgSO4?

#### Understand the Problem

The question is asking for the molecular mass of magnesium sulfate (MgSO4). This involves adding the atomic masses of all the elements in the compound to calculate its total molecular mass.

120.366 u

The molecular mass of MgSO_4 is 120.366 u

#### Steps to Solve

1. Identify atomic masses of constituent elements

Identify the atomic masses of magnesium (Mg), sulfur (S), and oxygen (O) from the periodic table:

• Magnesium (Mg) = 24.305 u
• Sulfur (S) = 32.065 u
• Oxygen (O) = 15.999 u
1. Calculate the total mass of oxygen atoms

MgSO$_4$ contains 4 oxygen atoms, so multiply the atomic mass of oxygen by 4:

$$\text{Total mass of O} = 4 \times 15.999 = 63.996 \text{ u}$$

1. Sum the masses of all atoms in MgSO$_4$

Add the atomic masses of magnesium, sulfur, and the total mass of oxygen to get the molecular mass of MgSO$_4$:

$$\text{Molecular mass of MgSO}_4 = 24.305 + 32.065 + 63.996 = 120.366 \text{ u}$$

The molecular mass of MgSO_4 is 120.366 u