The mass fraction of carbon, hydrogen and oxygen are, respectively, 64.87%, 13.51% and 21.62%, and the vapor density
| December 21, 2020 | education
The mass fraction of carbon, hydrogen and oxygen are, respectively, 64.87%, 13.51% and 21.62%, and the vapor density in air is 2.55. Find the molecular formula of the substance.
CxHyOz
Let’s compose the ratio:
x: y: z = 64.87 / 12: 13.51 / 1: 21.62 / 16 = 5.4: 13.51: 1.35 = 4: 10: 1
M (CxHyOz) = 2.55 * 29 = 73.95 g / mol
4x * 12 + 10x + x * 16 = 73.95
74x = 73.95
x≈1
Those. substance formula C4H10O
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