SATHEE: Some Basic Concepts Of Chemistry Question 47

Some Basic Concepts Of Chemistry Question 47

Question: Complete combustion of $0.858 g$ of compound X gives 2.64 g of $C O_{2}$ and 1.26g of $H_{2} O$ . The lowest molecular mass X can have:

Options:

A) 43 g

B) 86 g

C) 129 g

D) 172 g

Show Answer

Answer:

Correct Answer: A

Solution:

[a] Moles of $C =^{n} C O_{2} = \frac{2.64}{44} = 0.06$
$\Rightarrow$ mass of C= 0.72 Mole of $H = 2 \times M o l e s$ of $H_{2} O =$ $2 \times \frac{1.26}{18} = 0.14 \Rightarrow$ mass of $H = 0.14$ Compound does not contains oxygen. So $E F \to C_{0.06} H_{0.14} \Rightarrow C_{3} H_{17}$
$\Rightarrow$ Lowest M.M. = 43

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Some Basic Concepts Of Chemistry Question 47

Question: Complete combustion of 0.858g of compound X gives 2.64 g of CO2 and 1.26g of H2O . The lowest molecular mass X can have:

Options:

Answer:

Solution:

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Question: Complete combustion of $0.858 g$ of compound X gives 2.64 g of $C O_{2}$ and 1.26g of $H_{2} O$ . The lowest molecular mass X can have: