If chlorine and fluorine react according to the reaction (to balance):

Question

Cl2+ F2→ ClF3
And calculate the amount of product and of limiting reagent that remains, when 10 g of chlorine and
30 g of fluorine are reacted to give chlorine trifluoride.

Answer 1

First balance the equation. The product has a ratio of 1:3 for the atoms. So,

2Cl2 + 6Fl2 = 4ClF3

convert to moles of each reactant

The one with the lesser no. of moles needed will limit the reaction.

Then figure how many moles of product are produced, and go back to grams.