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2013-02-04

Number of Atoms & Number of Molecules

Which of the following substance contains 1.204 x 1024 atoms?

A  1 mol of nitrogen gas
B  1 mol of ammonia
C  1 mol of water
D  1 mol of argon

Many of my students choose the wrong answer in the current topical test.

1 mol of nitrogen gas consists of 1 x 6.02 x 1023 molecules. 















Number of atoms in 1 mol of nitrogen gas is 2 x 6.02 x 1023 .
(Each nitrogen, N2 molecule consists of 2 nitrogen atoms)

1 mol of ammonia consists of 1 x 6.02 x 1023 molecules











Number of atoms in 1 mol of ammonia gas is 4 x 6.02 x 1023.
(Each ammonia, NH3 molecule consists of 4  atoms) 

1 mol of water consists of 1 x 6.02 x 1023 molecules














Number of atoms in 1 mol of water is 3 x 6.02 x 1023
(Each water, H2O molecule consists of 3 atoms) 

1 mol of argon consistss of 1 x 6.02 x 1023 atoms. 


The correct answer : A

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