Following are the calculation of the mass is grams:
For point a:
The mass of an atom could be estimated by multiplying the number of moles of a material by its molar mass.
Using formula:
[tex]\bold{moles\ N\times\frac{ grams\ N}{moles \ N}=grams\ N}[/tex]
According to the periodic table, nitrogen's molar mass is [tex]\bold{14.01 \ \frac{g}{mol}}[/tex]
[tex]\to \bold{2.00\ moles\ N \times\frac{14.01 g\ N}{1\ mole \ N}=28.02\ grams \ N}[/tex]
For point b:
In this, we use Avogadro's number to calculate the mass:
[tex]\to \bold{3.01\times 10^{23} \ atoms \times\frac{1 \ mol}{ 6.022\times 10^{23} \ } \ atoms\times \frac{35.45}{1 \ mol}=17.7\ grams }[/tex]
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