How many grams of potassium chloride is produced if 6.78 mols of potassium reacts?

Potassium react with chlorine to form potassium chloride

2K + Cl2 - - - > 2 KCl

The reacting ratio of potassium reacted and KCl produced is 1:1

by use of this ratio the number of moles of KCl produced is therefore = 6.78moles

mass = molar mass x number of moles

molar mass of KCl=74.5 g/moles

mass is therefore = 74.5 x 6.78moles=505.11g