Basic Chem - Molar Percentage problem.

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SUMMARY

The discussion centers on calculating the molar percentage of nitrogen in 1 kg of nickel(II) nitrite, Ni(NO2)2. The formula for molar percentage is defined as mol% of A = n(A) / n(total) * 100. The confusion arises from the inclusion of mass in the calculation; however, it is established that molar percent is independent of mass, allowing the mass to be disregarded in this context.

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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 [tex]\frac{2}{1+2+4} * 100[/tex], 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
 
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Yes, molar percent is mass independent. You can safely ignore 1 kg.

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