Question

8. The molecular mass of oxygen is 32.

a) What is the GMM of 02?

b) How many moles of molecules are there in 64 g of oxygen? How many
molecules are there in it?

c) Calculate the number of oxygen atoms present in 64g of oxygen?

Give explanation ​

Answer 1

$\underline{\purple{\ddot{\MasterRohith}}}$

Given:-

• Molecular mass of oxygen is 32.

To find :-

1. What is the GMM of O2
2. How many moles of molecules are there in 64g of oxygen?How amny molecules are there in it .
3. Calculate the number of oxygen atoms present in 64g of oxygen.

Explanation :-

Case i)

• Here we should find Gram molecular mass

• GMM of O2 = 2× 16=32.

Case ii)

• No of mole molecules =Mass/GMM=64/32=2.
• No of molecules = mole × 6.022×10^23
• =2×6.022×10^23.

Case iii)

• No of atoms = Number of molecules ×no of molecules in one molecules

• Number of atoms = 2×6.022×10^23×2
• Number of oxygen atom present in 64g of oxygen is = 4×6.022×10^23

Hope it helps u mate .

Thank you .