3. Calculate the molar ratio of copper to oxygen from: (moles copper) / (moles o

Question

3. Calculate the molar ratio of copper to oxygen from: (moles copper) / (moles of oxygen in the copper oxide)
Materials Used -50 mL beaker -balance - 5 g Copper sulfate pentahydrate -30 mL of water -test tube Method 2 1. Place empty beaker on balance and record mass: 85.000 g 2.Take empty beaker off balance, place on lab area and then add 5 g of Copper sulfate pentahydrate 3.Place beaker and copper sulfate pentahydrate unto balance and record mass: 90.00 0 g 4·Dissolve copper sulfate pentahydrate by adding 30 mL of water 5.Then add 10 mL of 6M sodium hydroxide Reaction: Color change from blue to transparent 6. Transfer the liquid content to a new beaker and the hard material in the old beaken 7. Place a test tübe on the balance and record mass: 27.400 g place on top of Bunsen bumer ane then allow to cool on workbench before recording n Place on top of Bunsen burmer and then allow to cool on workbench before recording ew mass: 28.993 g

Explanation / Answer

mass of CuSO4.5H2O = 5 g

moles of Cu = 5 g/249 g/mol = 0.021 mols

moles of NaOH used = 6 M x 10 ml = 60 mmol = 0.06 mols

moles of Cu(OH)2 = 0.06/2 = 0.03 mols

moles of CuO formed from it = 0.03 mols

3. mole ratio of Cu/oxygen = 0.021/0.03 = 1.0 (approx)

4. Empirical formula of Copper oxide = CuO

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