Question

An atom of some element Y weighs 6.644 × 10-23 g. Calculate the number of gram-atoms in 40 kg of it. 9. Calculate number of oxygen atoms in 88g CO2. Also calculate mass of CO having same number of Oxygen atoms.

Answer 1

Atomic mass of the element = Mass of one atom × 6.02 × 10 23 = 6.644 × 10-23 × 6.02 × 1023 = 40 g No. of gram atoms = Mass of the element in grams/No. ...

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Answer 2

Explanation:

Atomic mass of the element =Massofoneatom×6.02×10

23

=6.644×10

−23

×6.02×10

23

=40g

No. of gram atoms =

No.ofgram

Massoftheelementingrams

​

=

40

40000

​

=1000