Question

Find the mass of 18.011×10² of oxygen atoms

Mass = Molar mass × Number of moles

(if you don't know don't ans it by typing random things that makes no sense)​

Answer 1

Explanation:

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>>Introduction to Molecules

>>What is the mass of one molecule of oxyg

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What is the mass of one molecule of oxygen?

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Solution

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Correct option is A)

The molecular weight of oxygen is 32 g/mol.

Hence, one mole of oxygen weighs 32 g.

One mole of oxygen contains 6.023×10

23

molecules.

The mass of one molecule of oxygen is:

6.023×10

23

32

=5.31×10

−23

g.

Answer 2

Answer:

The mass 18.011 × $10^{2}$ of oxygen atoms is 4.783 × $10^{-20}$ g

Explanation:

We know that the one mole of oxygen atom contains 16 g.

One mole of a substance contains an Avogadro number of particles.

That is $6.023$ × $10^{23}$ atoms have the mass of 16.

So we can say that the mass of one atom of oxygen

                                                                = $\frac{16}{6.023*10^{23} }$ = 2.656 × $10^{-23}$ g

Therefore the mass of $18.011$ × $10^{2}$ of oxygen atoms

                                = 18.011 × $10^{2}$ × 2.656 × $10^{-23}$

                                = 4.783 × $10^{-20}$ g