Question

Calculate the mass percent composition of nitrogen in each of the following nitrogen compounds.

1. N2O3
2. NF3
3. N2H4
4. HNO2

Answer 1

To calculate the mass percent composition of nitrogen, first determine the formula mass of the compound. Then, calculate the total mass of nitrogen and divide by the formula mass. Finally, multiply by 100 to get the percentage.

Step-by-step explanation:

To calculate the mass percent composition of nitrogen in compounds, use the formula mass of the compound and the atomic masses of the elements it contains. Here are the steps to follow for each compound:

1. Calculate the formula mass of the compound.
2. Find the total mass of nitrogen in the compound by adding the atomic masses of all nitrogen atoms in the formula.
3. Divide the total mass of nitrogen by the formula mass of the compound.
4. Multiply the result by 100 to get the percent composition.

1. For N2O3: The formula mass is 2(14.01 amu for N) + 3(16.00 amu for O) = 108.02 amu. Nitrogen's mass percent = (2(14.01) / 108.02) x 100 = 25.93%

2. For NF3: The formula mass is 3(19.00 amu for F) + 14.01 amu for N = 71.01 amu. Nitrogen's mass percent = (14.01 / 71.01) x 100 = 19.73%

3. For N2H4: The formula mass is 2(14.01 amu for N) + 4(1.008 amu for H) = 32.05 amu. Nitrogen's mass percent = (2(14.01) / 32.05) x 100 = 87.36%

4. For HNO2: The formula mass is 1.008 amu for H + 14.01 amu for N + 2(16.00 amu for O) = 47.02 amu. Nitrogen's mass percent = (14.01 / 47.02) x 100 = 29.78%