Question

Please help.

The number of atoms present in 0.5 g-atom of nitrogen is same as the atoms in

a. 12g of carbon

b. 32g of sulphur

c. 8g of oxygen

d. 24g of magnesium



Along with the answer please explain how , i really need it.

Answer 1

Atomic mass of nitrogen = 14 g

Therefore, mass of 1 mole of nitrogen = 14g

Now, 1 mole = 6.022 x 1023 atoms

Since, 1 g-atom = 1 mole

0.5 g-atom = 0.5 moles

Therefore, no. of atoms in 0.5 moles of Nitrogen = 6.022 x 1023 x 0.5

  = 3.011 x 1023

Now,

12 g carbon = 1 mole carbon

32 g sulphur = 1 mole sulphur

8 g oxygen = 0.5 mole oxygen

24 g magnesium = 1 mole magnesium

Number of atoms in 0.5 mole oxygen = = 3.011 x 1023

Hence, option (c) is correct.

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