Answer
a. $63.65\%$
b. $46.68\%$
c. $30.45\%$
d. $22.23\%$
Work Step by Step
a.
1. Calculate the molar mass of: $N_2O$
Molar Mass ($N_2O$):
14.01* 2 + 16.00* 1 = 44.02g/mol
2. Calculate the total mass of $N$ in one mole of this compound:
Total Mass ($N$): $ 2 \times 14.01g = 28.02g$
3. Find the mass percent composition:
$\frac{Total-mass (N)}{Molar-Mass} \times 100\% = \frac{ 28.02}{ 44.02} \times 100\% = 63.65\%$
b.
1. Calculate the molar mass of: $NO$
Molar Mass ($NO$):
14.01* 1 + 16.00* 1 = 30.01g/mol
2. Calculate the total mass of $N$ in one mole of this compound:
Total Mass ($N$): $ 1 \times 14.01g = 14.01g$
3. Find the mass percent composition:
$\frac{Total-mass (N)}{Molar-Mass} \times 100\% = \frac{ 14.01}{ 30.01} \times 100\% = 46.68\%$
c.
1. Calculate the molar mass of: $NO_2$
Molar Mass ($NO_2$):
14.01* 1 + 16.00* 2 = 46.01g/mol
2. Calculate the total mass of $N$ in one mole of this compound:
Total Mass ($N$): $ 1 \times 14.01g = 14.01g$
3. Find the mass percent composition:
$\frac{Total-mass (N)}{Molar-Mass} \times 100\% = \frac{ 14.01}{ 46.01} \times 100\% = 30.45\%$
d.
1. Calculate the molar mass of: $HNO_3$
Molar Mass ($HNO_3$):
1.008* 1 + 14.01* 1 + 16.00* 3 = 63.02g/mol
2. Calculate the total mass of $N$ in one mole of this compound:
Total Mass ($N$): $ 1 \times 14.01g = 14.01g$
3. Find the mass percent composition:
$\frac{Total-mass (N)}{Molar-Mass} \times 100\% = \frac{ 14.01}{ 63.02} \times 100\% = 22.23\%$
