What is the mass of 2.42 x 10^24 atoms of sodium?
All you need is a conversion factor: 2.42 x 10^24 atoms Na x (23.0 g Na / 6.02 x 10^23 atoms Na) = 92.5 g Na A conversion factor is a ratio of any two quantities which are equal to each other. That way the ratio is always equal to 1, and does not change the value of what you are converting, only its units. In this case, 1 molar mass = an Avogadro’s number of atoms, so 23.0 grams Na = 6.02×10^23 atoms Na.
