How many molecules are there in 2.50 moles of methane?

we know there are 6.023 * 10^23 molecules in one mole of CH4. To find how many molecules are present in 5.8 moles of CH4, all we have to do it multiply Avogadro's number by 2.50 Therefore, there are 15.0575 * 10^23 molecules in 2.50 moles of CH4.