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Chemistry Forums for Students => High School Chemistry Forum => Topic started by: skyelit on September 11, 2007, 04:19:37 AM

Title: finding excess reactant's mass
Post by: skyelit on September 11, 2007, 04:19:37 AM

I was wondering...If two reactants have the same mass (eg. 1.0g) and they are present in a 1:2 ratio...is it possible to calculate the mass of the excess reactant..WITHOUT finding the number of mole and so on... >:( ::) :-[ :-X

Title: Re: finding excess reactant's mass
Post by: AWK on September 11, 2007, 05:21:54 AM

Quote from: skyelit on September 11, 2007, 04:19:37 AM

I was wondering...If two reactants have the same mass (eg. 1.0g) and they are present in a 1:2 ratio...is it possible to calculate the mass of the excess reactant..WITHOUT finding the number of mole and so on... >:( ::) :-[ :-X

To start any calculations concerning limiting (or excess) reagent you should know an exact stoichiometry of reaction (balanced equation).

In your example you have 1:1 mass ratio of reagent, and probably 1:2 molar ratio of reagents but no reaction is given