# How many moles in 4.7x10X24 atoms CU?

4.7 X 1024 atoms Cu (1 mole Cu/6.022 X 1023)

= 7.8 moles copper

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### How many atoms in 1 cm3 of copper?

The density of copper (Cu) is about 8.92 g/cm3. So 1 cm3 of copper is about 8.92 g. Next find the number of moles in 8.92 g of copper by dividing by its molecular weight: 8.92 g Cu / 63.54 g/mol Cu = 0.14038 mol Cu By definition 1 mol of any substance is Avogadro's number of atoms or, 6.022 x 10 23 atoms. So, 0.14038 mol Cu * [6.022x1023 atoms Cu / mol Cu]…

### What is the maximum amount of Cu that could be produced by reacting 20.0 grams of Al with excess CuSO4?

find moles: 20.0 grams of Al @ (27.0 g/mol) = 0.7407 moles of Al by the reaction: 2 moles Al+3CuSO4 â†’ Al2(SO4)3 +3 moles Cu 0.7407 moles of Al produces 3/2 's as many moles of Cu = 1.11 moles of Cu find mass, using molar mass: 1.11 moles of Cu @ (63.5 g/mol) = 70.6 grams of Cu your answer is 70.6 g

### How many Cu atoms are in the 0.0159 mol sample?

The molar mass of copper is approximately 63.5 g. To find how many of these are in our sample we must divide.0.0159/63.5 = 2.5 x 10 ^ -4 = 0.00025 moles. Each mole contains the Avogadro number of atoms, i.e. 6.023 x 10 ^ 23, so in total we have 0.00025x 6.023 x 10 ^ 23 = 1.51 x 10 ^ 20 atoms approximately.