How many grams of potassium fluoride can form if 4.00 grams of potassium are reacted with 3.00 grams of fluorine gas according to the reaction 2K (s) plus F2 (g) and rarr 2KF (s)?

The molar mass of K is 39.10 g/mol and F is 19.00 g/mol. Calculate the moles of each reactant using their given masses, then determine the limiting reactant. In this case, K is the limiting reactant, so all K will react. If 4.00 g of K reacts, it will form the same amount (4.00 g) of KF because the stoichiometry is 2:2.