Answer:
74.02%
Step-by-step explanation:
Mass percentage -
Mass percentage of A is given as , the mass of the substance A by mass of the total solution multiplied by 100.
i.e.
mass % A = mass of A / mass of solution * 100
Given,
mass of carbon = 12 g/mol
mass of nitrogen = 14 g/mol
mass of hydrogen = 1 g/mol
Hence , the mass of solution is calculated as the summation of the mass of the atom * number of atom ,
Hence ,
mass of solution = 10 * 12 g/mol + 14 * 1 g/mol + 14 * 2 g/mol = 162 g/mol
Mass of carbon = 10 * 12 g/mol = 120 g/mol
The mass percent of carbon can be calculated from using the above formula
mass % C = mass of C / mass of solution * 100
mass % C = 120 g/mol / 162 g/mol * 100
mass % C = 74.02% .