The molar mass of neon is 20 grams per mole. That means approximately every 6x10^23 neon atoms weighs 20 grams. So then, approximately how many grams would 30 x10^23 atoms of Neon, Ne, weigh?

Question

answer has to be a whole number

Answer 1

In this chunk of given information, lets first figure out what is our knowns and what are our conversion factors.

They tell us the molar mass or that 1mol Ne = 20 grams Ne. They also mention that 6 x 10²³ atoms of Ne = 20 grams of Ne. These both are our conversion factors because they tell us the relationship between both objects.

We are then told to find grams from 30 x 10²³ atoms of Ne. Since we only know the atoms, this will be our starting point. Lets use the conversion factor 6 x 10²³ atoms of Ne = 20 grams of Ne because it will give us directly atoms to grams. Remember, always divide by same units and multiply different units.

In our case, we start with 30 x 10²³ atoms Ne, so we need to multiply by grams and divide by atoms.

30 x 10²³ atoms of Ne x 20 g Ne / 6 x 10²³ atoms Ne = 100 grams of Ne.