Questions


1		What is the percent by weight of a solution containing 2.19 g NaCl in 75 g of the solution?



2		What is the percent by weight of a solution prepared by dissolving 10 g of NaCl in 100 g of H₂O?



3		A concentration of 0.5 ppm by volume SO₂ in air is harmful to plant life. What is the percent by volume of this concentration?



4		What is the volume of water in a 500 mL bottle of rubbing alcohol that has a concentration of 70% by volume?



5		If a definition of intoxication is an alcohol concentration of 0.05 percent by volume in blood, how much alcohol would be present in the average (155 lb) person's 6,300 mL of blood if that person was intoxicated?



6		How much pure alcohol is in a 355 mL bottle of a "wine cooler" that is 5.0% alcohol by volume?



7		In the 1970s, when lead was widely used in "ethyl" gasoline, the blood level of the average American contained 0.25 ppm lead. The danger level of lead poisoning is 0.80 ppm. (a) What percent of the average person was lead? (b) How much lead would be in an average 80 kg person? (c) How much more lead would the average person need to accumulate to reach the danger level?



8		Draw a circle around the proton donor and a box around the proton acceptor for each of the reactants and label which acts as an acid and which acts as a base. H₃PO_4(aq) + H₂O_(l)⇔ H₃O⁺_(aq) + H₂PO₄^-_(aq) N₂H_4(l) + H₂O_(l)⇔ N₂H₅⁺_(aq) + OH^-_(aq) HNO_3(aq) + HC₂H₃O_2(aq)⇔ H₂C₂H₃O₂⁺_(aq) + NO₃^-_(aq) 2 NH₄⁺_(aq) + Mg_(s)⇔ Mg²⁺_(aq) + 2 NH₃⁺_(aq) + H_2(g)

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