What is the mass of 0.31 1 mol of the element
potassium (K)?
Answer in units of g

0.31 mol K x 39.1 grams K/ 1 mol k = 12.1 g

Explanation:

molar mass of K: 39.1

In order to find the mass in 0.31 mol of K, you must covert moles to grams. In one mole of Potassium there is 39.1 grams.

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