Question

Calculate the mass percent composition of nitrogen in each of the following nitrogen compounds. You may want to reference (Pages 181 - 186) Section 4.10 while completing this problem. Part A NO Express your answer using four significant figures. EVO ALDO ? mass %N- Submit Request Answer Part B BN Express your answer using four significant figures. 0 AED - O ?

Answer 1

The mass percent composition of nitrogen in each of the following compounds can be calculated as follows: Mass percent of nitrogen = mass of nitrogen in the compound molar mass of compound Part A NO. Molar mass of N=14 g/mol. Molar mass of O = 16 g/mol. Molar mass of N, O, = 2 x14 g/mol +5x16 g/mol = 28 g/mol +80 g/mol =108 g/mol Mass of nitrogen in the compound = 2 x14 g/mol = 28 g/mol The mass percent composition of nitrogen in N, O, is calculated as shown below: Mass percent of nitrogen = mass of nitrogen in the compound molar mass of compound Ix 100 ( 28 g/mol x100 108 g/mol) = 25.92% Part B BN Molar mass of N= 14 g/mol. Molar mass of B = 10.8 g/mol. Molar mass of BN = 10.8g/mol +14g/mol = 24.8 g/mol Mass of nitrogen in the compound = 14 g/mol The mass percent composition of nitrogen in BN is calculated as shown below:

Mass percent of nitrogen= mass of nitrogen in the compound molar mass of compound ( 14g/mol X100 24.8 g/mol = 56.45% Part C NH, Molar mass of N= 14 g/mol. Molar mass of H= 1 g/mol. Molar mass of N,H, = 2 x14 g/mol + 2x1g/mol = 28 g/mol +2g/mol =30g/mol Mass of nitrogen in the compound = 2 x14 g/mol = 28 g/mol The mass percent composition of nitrogen in N,H, is calculated as shown below: 100 mass of nitrogen in the compound Mass percent of nitrogen = molar mass of compound _28g/mol x 100 (30g/mol = 93.33% Part D HCN Molar mass of N= 14 g/mol. Molar mass of C = 12 g/mol. Molar mass of H= 1 g/mol. Molar mass of HCN = 1g/mol +12 g/mol +14 g/mol = 27 g/mol Mass of nitrogen in the compound = 14 g/mol

The mass percent composition of nitrogen in HCN is calculated as shown below: 100 ( mass of nitrogen in the compound Mass percent of nitrogen = molar mass of compound 14 g/mol 27 g/mol = 51.85% 0x100