How many moles of ch4 are present if there are 3.58 x 10^24 molecules of ch4?

The value for Avogadro's number is 6.022 x 10^23 molecules/mol

To get the number of moles of Ch4 from 3.58 x 10^24 molecules of Ch4, we will just solve like this;

(3.58 x 10^24 molecules Ch4)  ÷ (6.022 x 10^23 molecules/mol) = 5.94 x 10^23 moles Ch4

Therefore, the number of moles of Ch4 is 5.94 x 10^23.

I hope, this will help you.
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The density of water is 1 g/cm cubed and in order for the pebble to sink its density has to be greater than the density of water and in order for the twig to float its density has to be less than the density of water