amphetamine (c9h13n) is a powerful stimulant. what is the percent composition of all of the elements in this compound?
A. 9%C;13%H;1%N
B. 30%C;10%H;60%N
C. 60%C;35$H;5%N
D. 80%C;9.6%H;10.4%N
I think b
Nope. It's done the same way the C in C3H8 is done. Follow that route.
You're guessing. Follow the % carbon in the C3H8 problem.
To determine the percent composition of elements in a compound, we need to calculate the molar mass of each element and divide it by the total molar mass of the compound, then multiply by 100 to convert it into a percentage.
The molar mass of carbon (C) is 12.01 g/mol, hydrogen (H) is 1.01 g/mol, and nitrogen (N) is 14.01 g/mol.
For amphetamine (C9H13N), we calculate the total molar mass as follows:
(9 atoms of C) x (12.01 g/mol) + (13 atoms of H) x (1.01 g/mol) + (1 atom of N) x (14.01 g/mol) = 135.19 g/mol
To find the percent composition of each element, we divide the molar mass of each element by the total molar mass of the compound and multiply by 100:
Carbon (C):
(9 atoms of C) x (12.01 g/mol) / (135.19 g/mol) x 100% ≈ 80.02% ≈ 80%C
Hydrogen (H):
(13 atoms of H) x (1.01 g/mol) / (135.19 g/mol) x 100% ≈ 9.61% ≈ 9.6%H
Nitrogen (N):
(1 atom of N) x (14.01 g/mol) / (135.19 g/mol) x 100% ≈ 10.37% ≈ 10.4%N
So, the correct answer is option D. 80%C; 9.6%H; 10.4%N.