Question

How many moles of methane (CH4) are in 7.31 x 10^25 molecules

Answer 1

Answer : The number of moles of methane are, 121.39 moles

Explanation : Given,

Number of molecules of methane gas =
`7.31* 10^(25)`

Now we have to calculate the number of moles of methane gas.

As,
`6.022* 10^(23)` number of molecules of methane present in 1 mole of methane gas.

So,
`7.31* 10^(25)` number of molecules of methane present in
`(7.31* 10^(25))/(6.022* 10^(23))* 1mole=121.39` moles of methane gas.

Therefore, the number of moles of methane are, 121.39 moles

Answer 2

molar mass of methane CH4

= C + 4 H

= 12.0 + 4 x 1.008

= 12.0 + 4.032

= 16.042g/mol

7.31 x 10^25 molecules x 1 mole CH4 = 121.43 moles

6.02 x 10^23 CH4 molecules

121.43 moles CH4 are present.