# G? of KClO3 to produce 50g of O2

1. Sep 17, 2011

### Reema

We had this question in the lecture .. but I couldn'nt copy the steps I was trying to understand but I dind'nt looool.

How many grams of KClO3 are required to produce 50 g of 02 from the following decomposition reaction?

2KClO3 ---> 2kClO3 + 3O2

the final answer is 127

I tried to work it out by myself by making a ratio

molar mass of 2KClO3 = 148.8 and for 3O2 = 48

grams of 02 = 3*50 = 150 grams
grams of of 2KClO3 = x

x\148 : 150\48

x=265

HELP!

2. Sep 17, 2011

### Staff: Mentor

You are doing strange things.

Huh? I guess it should be KCl on the right.

What do you mean by "molar mass of 3O2"? No such animal. There is a molar mass of O2. It is not 48.

No, 50 grams of O2. This is a number given in the question.

I am not even going to try to understand your ratio, as numbers you put in it are already off.

Try these pages:

stoichiometric calculations in general

stoichiometric calculations using ratios

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