Question

The number of moles present in 102 g of ammonia is
a. 7
b. 5
c. 6
d. 4​

Answer 1

Answer:

Correct option is

B

4

NH

3

Molecular weight = 14+3×1

=17

No. of moles =

molecularweight

gramweight

=

17

68

(given)

=4mol

Answer 2

Answer:

The number of moles present in 102 gm of ammonia is 6 moles .

Explanation:

• 1 mole equals to 6.022×10²³ numbers.
• It is amount of the substance present in the formula weight of that substance.

Let's give an example:

• The formula of Hydrogen gas is H2. So its molecular weight in gram is 2gm.
• So its formula weight is 2gm.
• It means 2gm of hydrogen molecule is equal to 1 mole or 2 gm of Hydrogen molecule contains 1 mole of Hydrogen molecule.

Ammonia molecule formula is NH3.

• Molecular mass of Ammonia= Mass of Nitrogen+ 3 × Mass of Hydrogen
• Molecular Mass of Ammonia = 14 + 3× 1 = 17
• 17 gms of Ammonia contains 1 mole of Ammonia.

1 gm of Ammonia contains no of moles of Ammonia =

$\frac{1}{17} moles$

102 gm of Ammonia contains number of moles of Ammonia =

$\frac{1}{17} \times 102 \: moles$

102 gm of Ammonia contains number of moles of Ammonia= 6 moles.

Conclusion:

6 moles of Ammonia is present in 102 gms of Ammonia.

For more information about mole concept following links are provided:

https://brainly.in/question/15416344?

https://brainly.in/question/5111149?