Answer to Question #14012 in Physical Chemistry for William Buford

Question

How many moles of zinc are there in 0.172 grams of the metal?

Answer 1

You must first know the molar mass of zinc. It is 65.4 g/mol. Now you can calculate the number of moles:
0.172 g x (1 mol / 65.4 g) = 0.003 mol (the grams cancel each other out, leaving you with just moles)