So let's try one more substance. Calculate the mass, in grams, of a molecule of sucrose, C12H22O11.
|
Calculate the number of magnesium atoms in 10.0 g of magnesium.
|
To answer this question we need to know the mass of a single sucrose molecule. We calculated that earlier and it was 5.68 x 10-22 grams. Therefore, the number of molecules of sucrose in 10.0 grams is;
We know how many sucrose molecules there are in 10.0 grams and we also know how many oxygen atoms there are in each sucrose molecule. We can answer the question with those two pieces of information;
We solve this question just like the question about the number of molecules in 10.0 grams,