# What does molar concentration express? Calculate the mass of potassium

What does molar concentration express? Calculate the mass of potassium orthophosphate contained in 400 ml of a 2M solution of this substance.

Let us write down the formula of potassium orthophosphate K3PO4 and its molar mass M (K3PO4) = 212 g / mol

The molar concentration of potassium orthophosphate is c (K3PO4) = n (K3PO4) / V (K3PO4), where n (K3PO4) is the amount of substance in moles, and V (K3PO4) is the volume in liters.

To calculate the mass of potassium orthophosphate by the formula m (K3PO4) = n (K3PO4) * М (K3PO4), you need to calculate n (K3PO4) = с (K3PO4) * V (K3PO4), then m (K3PO4) = с (K3PO4) * V (K3PO4) * M (K3PO4) = 2 * 0.4 * 212 = 169.6 g One of the components of a person's success in our time is receiving modern high-quality education, mastering the knowledge, skills and abilities necessary for life in society. A person today needs to study almost all his life, mastering everything new and new, acquiring the necessary professional qualities.