Question

Aminocyclohexane has a percent composition of 64% carbon, 11.5% hydrogen and 24.5% nitrogen. 8 moles of it weighs 900 grams.
What is the compounds empirical formula?
What is this compounds molecular formula?
How many hydrogen atoms are in a 3 mole sample?

Answer 1

@Vocaloid

Answer 2

@paki

Answer 3

If 8 mol aminocyclohexane is 900 g minocyclohexane , then the molar mass is 900 g/8 mol = 112.5 g/mol.

Assume there's 100 g of aminocyclohexane, then you can say in that sample there's 64 g C, 11.5 g H, and 24.5 N. Use the molar mass to convert these masses to moles.

(64 g C)(1 mol C/12 g C) = 5.3 mol C
(11.5 g H)(1 mol H/1 mol H) = 11.5 mol H
(24.5 mol N)(1 mol N/28 g N) = 0.875 mol N

Nitrogen has the smallest amount so divide all the amounts by 0.875 to get the subscripts
C: 5.3/0.875 = 6
H: 11.5/0.875 = 13
N: 0.875/0.875 = 1

So the empirical formula is \(C_6H_{13}N\).

Answer 4

Thx

Answer 5

Thx