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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Ch4 is nonpolar and insoluble in water. since all of the hydrogen atoms are evenly spread around the carbon atom even through the c h bond is polar all the poles cancel each other out.