Question

whic of the following has maximum number of molecules

a. 4g of H2 gas

b.1 mole of H2O gas

c.3 mole of CO

d.22g of CO2

Answer 1

1. 4g of Hydrogen gas.
The molar mass of Hydrogen gas = 2 g/ mol
This implies 2 g of hydrogen gas contains 1 mole of gas  
2g of Hydrogen gas = 6.022 × 1023 molecules
4 g of Hydrogen gas = 12.044 × 1023 molecules

2. 1 mole of H2O gas. 
As 1 mole = 6.022 ​ × 1023 molecules
Therefore 1 mole of H2O gas = ​6.022 ​× 1023 molecules

3. 3 mol of CO gas 
As 1 mole = 6.022 × 1023 molecules
Therefore 1 mole of CO gas = ​18.066 ​× 1023 molecules

4. 22g of CO2. 
The molar mass of CO2 = 44 g/mol
44 g of CO2 gas = 6.022 ​× 1023 molecules
22 g of CO2 = 3.022 ​× 1023 molecules

Hence, 3 mol of CO gas contains maximum number of molecules. 

Answer 2

more no of moles more molecules
4g of H2 that is 2 moles
1 mole of H2O
3 moles of CO
22 GM of CO2 is 0.5 moles

maximum no of molecules is in 3 moles of CO