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Chemistry Forums for Students => High School Chemistry Forum => Topic started by: kerilynn on July 10, 2008, 04:07:11 PM

Title: using the ideal gas loaw to solve stoichiometry problems
Post by: kerilynn on July 10, 2008, 04:07:11 PM

What volume of oxygen, measured at 27 degrees C and 101.325 kPa, is needed for the combustion of 1.11 kg of coal? Assume coal is 100% carbon.

C(s) + O2(g) ------ CO2(g)


can u please work me all the way through this problem

Title: Re: using the ideal gas loaw to solve stoichiometry problems
Post by: Borek on July 10, 2008, 04:17:33 PM

This is simple stoichiometry - convert 1.11 kg of C to moles (hint: you will need moler mass of C for that), calculate how many moles of O₂ you need (hint: how many moles of oxygen per 1 mole of C?) and use pV=nRT.

Answer calls for over two cubic meters of oxygen, if you are not close to that number, you are wrong.