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QUESTION

# Precious metals are commonly measured in troy ounces. A troy ounce is equivalent to 31.1 g. How many moles are in a troy ounce of gold? How many moles are in a troy ounce of platinum? of silver?

"Number of moles" = "Mass"/"Molar Mass"

The number of moles is a numerical unit. One mole of stuff unequivocally specifies "Avogadro's Number", N_A, 6.022xx10^23, individual items of that stuff.

Now the molar mass of gold is 196.97*g*mol^-1. From where did I get that mass? Did I know it from memory? From where will YOU get it if you are asked to use it?

So "Moles of gold" = (31.1*g)/(196.97*g*mol^-1) = ?? mol

And "Moles of platinum" = (31.1*g)/(195.08*g*mol^-1) = ?? mol.

And "Moles of silver" = (31.1*g)/(107.87*g*mol^-1) = ?? mol.

How do the individual numbers of platinum, silver, and gold compare in these quantities? Which quantity has the greatest monetary value?

On a personal level, I think only a really decadent society would continue to use such an absurd unit as a "troy ounce". For God's sake!