1311 Practice Questions Oxidation and Reduction 4. What is the oxidation state (or number) of the elements in bold? a) P2O5 b) H2O2 c) NaH 5. Which substance is being oxidized and which is being reduced? d) Cr20,2 e) Se f)PO, g) LICOO2 Mn (s) + Pb(NO3)2 (aq) → Mn(NO3)2 (aq) + Pb (s) Molarity 6. Calculate the molarity of a 175 mL sugar solution that was prepared with 0.15 mole of sugar. 7. A salt solution is to be added to a marine aquarium. Calculate the molarity of a salt solution that is prepared by adding water to 18.65 g of NaCl to give a final volume of 250.0 mL. Dilution 8. How much 2.0 M NaCI solution would you need to make 250 mL of 0.15 M NaCl solution? Solution Stoichiometry .COA 9. How many grams of Ca(OH)2 are needed to neutralize 25.0 mL of 0.1 M HNO3? 10. What volume of 0.500 M HCl is needed to react completely with 0.100 mols of Pb(NO3)2? #of moles y-PbClzlm -РЬСЕО (M)= VoI. 2HCI +PB(WO3)z(ay Molarity O. 200 O.500M 0,200 =0.400L

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