
William W. answered 03/30/23
Math and science made easy - learn from a retired engineer
Calculate the molar mass of K2O as follows:
K = 39.098 g/mol (from the periodic table) x (2 atoms) = 78.196 g/mol
O = 15.999 g/mol (from the periodic table) x (1 atom) = 15.999 g/mol
Add them up: 78.196 + 15.999 = 94.195 g/mol
Divide 77.5 g by 94.195 g/mol and you get 0.823 moles of K2O