The molar mass of CO2 is 44g/mol. If you produce 22g, that means you produce 22g/44g/mol = 0.5 mol of CO2.
For 12 moles of CO2, you need 2 moles of benzene. Therefore, for 0.5 mol of CO2, you will need 0.083 mol of benzene (0.5 mol divided by 6 since you need six times less benzene than CO2).
The molar mass of benzene is 78 g/mol. Therefore, 0.083 mol of benzene is 6.47 g (o.083 mol x 78 g/mol).
The answer is 6.47g of benzene is needed.
it is because of the alignment of atoms. in magnets all the atoms are aligned in same direction. so magnetic force of each atom combines and creates stronger magnetic forces. but in non magnetic materials the atoms are aligned in random directions, then the magnetic force of one atom is cancelled by other