Question

1.The largest number of atoms is present in :

a)    40 g Ca

b)    48.0g of Mg

c)    71.0g of Cl

d)    4.0g of H2​

Answer 1

Answer:

4 g of H2

Explanation:

4 g of hydrogen contains the largest number of atoms.

(A) 4 g of hydrogen (molar mass 2) corresponds to 2 moles of molecules or 4N number of atoms where N is the Avogadro's number (6.023×10^23).

(B) 16 g of oxygen (molar mass 32) corresponds to 0.5 moles of molecules or N number of atoms where N is the Avogadro's number (6.023×10^23 ).

(C) 28 g of nitrogen (molar mass 28) corresponds to 1 mole of molecules or 2N number of atoms where N is the Avogadro's number (6.023×10^23) .

(D) 18 g of water (molar mass 18) corresponds to 1 mole of molecules or 3N number of atoms where N is the Avogadro's number (6.023×10^23)

Answer 2

Answer:

4.0 g of H2

Explanation:

4gH2 = 4moles of H atoms ...

71g Cl = 2 moles of Cl atoms

48g Mg = 2 moles of Mg atoms

40g Ca =1 mole of calcium