Question

What is the mass of 2.70 moles of magnesium chloride, MgCl2?

Answer 1

First, calculate the molar mass of MgCl2:

Mg: 1 x 24.30 = 24.30

Cl: 2 x 35.45 = 70.9

   24.30 + 70.9 = 95.2g/mol

Mole = Mass / Molar Mass

2.70 moles = Mass / 95.2 g/mol

Mass = 2.70 mol x 95.2 g/mol

Mass = 257.04g

Answer 2

Answer: The mass of magnesium chloride is 257.1 grams.

Explanation:

To calculate the mass of magnesium chloride for given number of moles, we use the equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$

We are given:

Moles of magnesium chloride = 2.70 moles

Molar mass of magnesium chloride = 95.21 g/mol

Putting values in above equation, we get:

$2.70moles=\frac{\text{Mass of magnesium chloride}}{95.21g/mol}\\\\\text{Mass of magnesium chloride}=(2.70mol\times 95.21g/mol)=257.1g$

Hence, the mass of magnesium chloride is 257.1 grams.