Question

Which of the following has maximum number of atoms ?
A) 18g of H2O
B) 18g of O2
C) 18g of CO2
D) 18g of CH4

Answer 1

Answer:

1. 18g water = 1 mole
2. 18g oxygen = 18/32 moles
3. 18g carbon dioxide = 18/44 moles
4. 18g methane = 18/16 moles

Clearly 18g methane have maximum number of molecules as more no. of moles.

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Answer 2

Given:

18g of H2O

18g of O2

18g of CO2

18g of CH4

To Find:

The sample with the maximum number of atoms.

Solution:

D) 18g of CH₄ has the maximum number of atoms.

A) The molecular mass of H₂O is 18g. Hence, 18g of H₂O has 1 mole of H₂O molecules. Since 1 water molecule has 3 atoms (2 H and 1 O), so 1 mole of H₂O has:

1 X 3 moles of atoms

= 3 moles of atoms

B) The molecular mass of O₂ is 32g. Hence, 18 g has 18/32 moles. Since 1 oxygen molecule has 2 atoms, so 18/32 moles will have:

18 X 2 / 32 moles of atoms

= 1.125 moles of atoms

C) The molecular mass of CO₂ is 44g. Hence 18g of CO₂ has 18/44 moles of molecules. Since 1 carbon dioxide molecule has 3 atoms (1 C and 2 O), so 18/44 moles will have:

18 X 3 / 44 moles of atoms

= 1.23 moles of atoms

D) The molecular mass of CH₄ is 16g. Hence 18 g of CH₄ has 18/16 moles of molecules. Since 1 molecule of methane has 5 atoms (1C and 4 H), so 18/16 moles will have:

18 X 5 / 16 moles of atoms

= 5.62 moles of atoms

So the order of the maximum number of atoms present in the given compounds is:

      18g CH₄ > 18g of H₂O > 18g of CO₂ > 18g of O₂