Question

a mixture contains ethene and ethyne gave 30L of CO2 consuming 50L of O2 under similar conditions of temperature and pressure. The total volume of the mixture in litres is
a)5
b)10
c)15
d)20

Answer 1

Answer on Question #53099 – Chemistry – Inorganic Chemistry

Task

A mixture contains ethene and ethyne gave 30L of CO₂ consuming 50L of O₂ under similar conditions of temperature and pressure. The total volume of the mixture in litres is

a) 5

b) 10

c) 15

d) 20

Solution

Data

According to Law of combining volumes and chemical reactions there is further proportions of gases volumes:

$$\frac{V (C_2 H_4)}{V (C O_2)} = \frac{1}{2}$$ $$\frac{V (C_2 H_2)}{V (C O_2)} = \frac{2}{4}$$

Three volumes of gases are equal to six volumes of carbon dioxide:

$$\frac{3 V \text{ (mixture of gases)}}{6 V (C O_2)} = \frac{1}{2}$$

If V (CO₂) = 30 L

then V (mixture of gases) = $\frac{V (C O_2)}{2} = \frac{30 L}{2} = 15 L$.

Answer: V (C₂H₄ and C₂H₂) = 15 L (c)

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