posted by Katie .
how many grams of potassium chlorate decomposes to potassium chloride and 638 mL of O2 at 128°C and 752 torr?
the formula given:
2KClO3(s) 2KCl(s) + 3O2(g)
Here is a solved example of the problem you have. Only the numbers are different. You will need to find moles O2 by using PV = nRT