QUESTION 25
How many H20 molecules are in 24 g H20?

8.03x10^23 molecules.

Explanation:

A background knowledge of Avogadro's hypothesis shows that 1 mole of any substance contains 6.02x10^23 molecules

From the above hypothesis which is know today as Avogadro's law, 1 mole of H2O also contains 6.02x10^23 molecules.

1 mole of H2O = (2x1) + 16 = 2 + 16 = 18g.

Now, we can find the number of molecules contained in 24g of H2O as follow:

18g of H2O contains 6.02x10^23 molecules.

Therefore, 24g of H2O will contain = (24x6.02x10^23)/18 = 8.03x10^23 molecules.

From the calculations made above,

24g of H2O contains 8.03x10^23 molecules.

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the positions which points up in upward carbon and down in downward carbon are axial

and vice versa holds true for equatorial positions

so the correct answer with labelled diagram will be