Posted by **Krissy** on Saturday, March 6, 2010 at 11:08pm.

I was given a question on an assignment and I can't figure it out.

The question is

A student collects 90ml of oxygen gas over water at 25c and a total pressure of 99.3kPa from the decomposition of KClO3.

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

a) How many mols of O2 were collected?

b)How many grams of KClO3 was decomposed?

For part a) would I change ml to L and then divide this number by the molar mass of O2 to get my answer?

for part b) I have no idea how to even attempt this any help is greatly appreciated.

on a side not would I change kPa to atm? if so is 99.3kPa*1atm/101kPa = .989 ?

Thank you in advance for any attempts made to help me figure this out.

## Answer This Question

## Related Questions

- Chemistry - Use Henry's law and the solubilities given below to calculate the ...
- chem - Use Henry's law and the solubilities given below to calculate the total ...
- chemistry - A student collects gas over water after reacting sodium bicarbonate ...
- Chemistry PLS HELP!!! - A student collects oxygen gas by water displacement at a...
- Chemistry - Use Henry's law and the solubilities given below to calculate the ...
- chemistry - Use Henry's law and the solubilities given below to calculate the ...
- Chemistry - Three of the primary components of air are carbon dixode, nitrogen, ...
- chem 102 - Use Henry's law and the solubilities given below to calculate the ...
- Chemistry - An 8.07g sample of impure Ag2O decomposes into solid silver and O2(g...
- Chemistry - At 20.0 degrees celcius, a student collects H2 gas in a gas ...

More Related Questions