How many grams of KCl is produced if 32.4 grams of O2 is produced?

2KClO3 (s) - - > 2KCl (s) + 3O2 (g)

Question 2 options:

0.54 grams KCl

6.87 grams KCl

25.7 grams KCl

50.3 grams KCl

Okay so, the molar mass (Mr) of O2 is 32g

moles = mass/Mr

moleS = 32.4/32 = 1.0125mol

the Mr of KCl is 39.1+35.5 = 74.6g

the ratio of moles of KCl to O2 is 2 : 3

therefore moles of KCl is (1.0125/3) * 2 = 0.675mols

mass = moles*Mr=0.675*74.6 = 50.355g

rounds up to 50.3g therefore last answer is correct