SATHEE: Some Basic Concepts Of Chemistry Question 27

Some Basic Concepts Of Chemistry Question 27

Question: Silver oxide $(A g_{2} O)$ decomposes at temperature $300^{\circ} C$ yielding metallic silver and oxygen gas. A 1.60 g sample of impure silver oxide yields 0.104 g of oxygen gas. What is the per cent by mass of the silver oxide in the sample?

Options:

A) 5.9

B) 47.125

C) 94.25

D) 88.2

Show Answer

Answer:

Correct Answer: C

Solution:

[c] Let mass of $A g_{2} O = x g$

$\begin{matrix} A g_{2} O & \overset{}{\to} & 2 A g & + \frac{1}{2} O_{2} \\ \overset{x g}{232 g}, & \frac{1}{2} \times 32 = 16 g, O_{2} \end{matrix}$

$\frac{16}{232} \times x = 0.104 \Rightarrow x = 1.508 g$ % of $A g_{2} O = \frac{1.508}{1.6} \times 100 = 94.25$ %

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Some Basic Concepts Of Chemistry Question 27

Question: Silver oxide (Ag2O) decomposes at temperature 300∘C yielding metallic silver and oxygen gas. A 1.60 g sample of impure silver oxide yields 0.104 g of oxygen gas. What is the per cent by mass of the silver oxide in the sample?

Options:

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Question: Silver oxide $(A g_{2} O)$ decomposes at temperature $300^{\circ} C$ yielding metallic silver and oxygen gas. A 1.60 g sample of impure silver oxide yields 0.104 g of oxygen gas. What is the per cent by mass of the silver oxide in the sample?