SATHEE: Some Basic Concepts Of Chemistry Question 127

Some Basic Concepts Of Chemistry Question 127

Question: A hydrocarbon contains 10.5 g carbon and 1g hydrogen. Its 2.4 g has 1 L volume as 1 atm and $127^{o} C$ . Hydrocarbon is

Options:

A) $C_{6} H_{7}$

B) $C_{6} H_{6}$

C) $C_{5} H_{6}$

D) $C_{6} H_{6}$

Show Answer

Answer:

Correct Answer: A

Solution:

[a] $C = 10.5 g = \frac{10.5}{12} m o l = 0.87 m o l$

$H = 1 g = \frac{1}{1} m o l = 1 m o l$

$∴$ ${(C_{Q .87})}_{7} = C_{6.09} H_{7} = C_{6} H_{7}$

$p V = n R T = \frac{w}{m} R T$

$1 \times 1 = \frac{24}{m} \times 0.082 \times 400$

$m = 79$ Hence, the hydrocarbon is $C_{6} H_{7}$ .

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