The formula is M (molarity) = mol / liters
molarity = ?
mass = 45.78g of MgCl2
Volume = 3.00L
1/ Convert grams to mol by using the formula: mol = mass / Molar mass
a/ Molar mass of MgCl2:
Mg = 1 x 24.30 = 24.30 g/mol
Cl = 2 x 35.45 = 70.9 g/mol
Add them together:
24.30 g/mol + 70.9 g/mol = 95.2 g/mol
b/ mol = mass / Molar mass
mol = 45.78 g / 95.2 g/mol
mol = 0.4808
==> 0.4808 mol of MgCl2
2/ M = ?
mol = 0.4808 mol of MgCl2
Volume = 3.00L
M = mol / liters
M = 0.4808 mol / 3.00 L
M = 0.16 mol/L
