Question

How many atoms are present in 80 grams of methane (c2h6)?

Answer 1

5 atoms are present in 80grams of methane

number of moles=mass/molar mass

and the molar mass of methane may be read straight off periodic table

molar mass of methane

=(12.011+4*1.00792).g.mol^-1

Mass/molar mass

80.g/16.0.g.mol^-1

.

. . 5 mole