The mass fractions of carbon and hydrogen in organic matter are 88.89 and 11.11%, respectively.

The mass fractions of carbon and hydrogen in organic matter are 88.89 and 11.11%, respectively. Its hydrogen vapor density is 27. What is the number of carbon and hydrogen atoms in a molecule?

Let’s implement the solution:

According to the condition of the problem, we write:
W (C) = 88.89%

W (H) = 11.11%

D (H2) = 27

Define: ShNu -?

Calculation:
M (CxHy) = D (H2) * M (H2) = 27 * 2 = 54 g / mol.

Let’s determine the amount of carbon, hydrogen:
Y (C) = 88.89 / 12 = 7.4 mol;

Y (H) = 11.11 / 1 = 11.11 mol.

C: H = X: Y = 7.4: 11.11 = 1: 2

Simplest formula: CH2

4. Let’s establish the formula:

CnH2n – general formula;

CnH2n – 2 = 54 g / mol;

14n = 52

n = 3 7 = 4

C4H6 – butyne; M (C4H6) = 12 * 4 + 6 = 54 g / mol.

Answer: the hydrocarbon formula is C4H6 (butyne).