Question

Which of the following is wrong combination
A) 6.022*10^23 molecules of oxygen = 32g of oxygen.
B) 6.022*10^23 ions of sodium =23g of sodium.
C) 6.022*10^23 atoms of C = 24g of carbon.
D) 6.022*10^23 atoms of H = 1g of hydrogen atom.

Answer 1

The wrong combination among the following is (C) 6.022*$10^{23}$  atoms of carbon = 24g of carbon

• Reason -

The number of atom present in 12g of carbon = $6.022 * 10^{23}$

The number of atom present in 24g of carbon = $\frac{6.022 * 10^{23} }{12} * 24$

                                                                               =  12.044 * $10^{23}$ atoms

•   What is Avogadro's Number?

Avogadro's number may be defined as the number of molecules in one gram-mole of any substance, element or compound.

It can also be defined as, the number of atoms present in 1 gram-atom of an elementary substance is Avogadro's number.

Answer 2

Option C) is the wrong statement $6.022$×$10^{23}$ atoms of C $= 24gm$ of Carbon

Explanation:

• 1 mole of carbon atom contains $6.022$×$10^{23}$ atoms = 12 gm
• 1 mole of carbon weighs 12 gm of carbon
• It is the number of units in one mole of a substance is the Avogadro's number
• Avogadro's constant is the proportionality constant which relates the number of constituents in the particles of a sample.
• The numeric value of Avogadro's constant is expressed in reciprocal mole and it has been assumed with a value known as Avogadro's number.