Question

calculate- (a)- the number of molecules of 0.25 mole of NH3

Answer 1

No. of molecules in 0.25 mole of NH₃ 
= 0.25 × Avogadro's number
= 0.25 × 6.022×10²³
= 1.5 × 10²³ molecules    Ans.

Answer 2

Answer:

Number of molecules are 1.5 x 10²³.

Explanation:

As per the question is stated,

We have been provided,

Number of moles of NH₃ = 0.25

Therefore,

The number of molecules can be defined by,

Number of molecules = Number of moles x Avogadro's Number

Now,

We know that the value of

Avogadro's Number is = 6.022 x 10²³  

So,

Number of Molecules is given by,

$Number\,of\,molecules=0.25\times (6.022\times 10^{23})\\Number\,of\,molecules=1.5\times 10^{23}\,molecules$

Therefore, the number of molecules are 1.5 x 10²³.