Question

which of the following groups has maximum number of molecules
a) 6g of Cl2
b) 8g of O2
c) 4g of He
d) 20g of NH3​

Answer 1

Answer:

20g of NH3 has Maximum number of molecules

Answer 2

20 g of $\mathrm{NH}_{3}$ will have the “maximum number of molecules”.  

Answer - (Option D)

Explanation:

To calculate the number of molecules in a compound, the following steps are followed:

• The chemical formula is derived and the No. of atoms is identified
• The ‘atomic weight of each element’ is found.
• The total atomic weight of the compound is calculated by adding the ‘atomic weights’ of each element in the compound.
• The ‘number of moles’ is calculated by dividing the known mass of the substance by the molar mass to get the No. of moles.
• The ‘number of moles’ is then multiplied by the Avagadro’s Constant to calculate the “No. of molecules” in a compound.
• Accordingly, 20 g of $\mathrm{NH}_{3}$ will have the maximum No. of molecules.