Question

6. A silver ring has a mass of 5.25 grams also. Calculate the number of silver atoms present in the ring?

Before you calculate, do you expect 5.25 grams of silver or gold to have more atoms?
7. A mercury thermometer breaks and spills 3.4 x 104 Hg atoms all over the floor. Calculate the mass of
mercury spilled on the floor?
8. 250.0 grams of silicon are massed on a scale. Calculate how many silicon atoms are present in the
sample?​

Answer 1

6. You must divide the mass by it’s molar mass to give you the total amount of moles within that piece. This will give you approx 0.05mol. You can now multiply this value by Avagadros constant which gives you 2.93 x 10^22 atoms. I would expect gold to have less atoms as it’s molar mass is higher than that of silvers, meaning that less atoms would be required to equal the same mass