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

August 27, 2021 | education

| **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

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