posted by Jester21 .
In a certain compound of copper and oxygen, a sample weighing 0.5424g contains 0.4831 g of Cu. How many moles of Cu in the sample? How many grams of Oxygen and how many moles of Oxygen are there in the sample? What is the mole ratio of Cu/O in the sample? What is the formula of the oxide and the molar mass of thye copper oxide?
mols Cu = g/atomic mass
g O = 0.5424 g total - 0.4831g Cu
mols O = g O/atomic mass O.
Find the ratio with the smallest number being 1.00; the easy way to do that is to divide the smallest number by itself, then divide the other number by the same small number. Post your work if you get stuck.