Answer to Question #112176 in Chemistry for Quinn Ruiz

Question

How many grams of K2O are in 1750 mL of 2.5 M solution?

Answer 1

Solution:

Molarity is the number of moles of solute per liter of solution.

Therefore,

C(K₂O) = n(K₂O) / V(solution).

Moles of K₂O = n(K₂O) = C(K₂O) × V(solution).

n(K₂O) = (2.5 M) × (1.75 L) = 4.375 mol.

n(K₂O) = 4.375 mol.

Molar mass is the mass of one mole of a substance.

Molar mass of K₂O is 94.196 g/mol.

Therefore,

Mass of K₂O = m(K₂O) = n(K₂O) × M(K₂O).

m(K₂O) = (4.375 mol) × (94.196 g/mol) = 412.108 g = 412.1 g

m(K₂O) = 412.1 g.

Answer: Mass of K₂O is 412.1 g.