Basic Chem - Molar Percentage problem.

[MarcMTL]

Homework Statement

Calculate the molar percent of nitrogen in 1kg of Ni(NO2)2.

Homework Equations

mol% of A = n(A) / n(total) * 100

The Attempt at a Solution

I'm stuck on this basic question. I have a tendency to say that the molar percent of nitrogen would basically be $$\frac{2}{1+2+4} * 100$$, basically the nb of moles of N over the sum of the total.

What's causing me confusing is the 1kg.

My question is: if I were looking for the specific number of moles, then the mass would be accounted for. But if it's molar percentt that's wanted, wouldn't it be independent of the mass?

Thanks.

Marc

 

[Borek]

Yes, molar percent is mass independent. You can safely ignore 1 kg.

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