SATHEE: Some Basic Concepts Of Chemistry Question 211

Some Basic Concepts Of Chemistry Question 211

Question: The number of molecules in 4.25 g of ammonia are [Pb. CET 2000]

Options:

A) $0.5 \times 10^{23}$

B) $1.5 \times 10^{23}$

C) $3.5 \times 10^{23}$

D) $1.8 \times 10^{32}$

Show Answer

Answer:

Correct Answer: B

Solution:

Molecular weight of $N H_{3}$ is 17 According to the mole concept $17, g m$ $N H_{3}$ has molecules $= 6.02 \times 10^{23}$

$∴ 1, g m$ $N H_{3}$ has molecules $= \frac{6.02 \times 10^{23}}{17}$

$∴$ $4.25, g m$ $N H_{3}$ has molecules $= \frac{6.02 \times 10^{23} \times 4.25}{17} = 1.5 \times 10^{23}, m o l e c u l e$

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