22) Children under the age of 6 with more than 0.10 ppm of lead in their blood c

Question

22) Children under the age of 6 with more than 0.10 ppm of lead in their blood can suffer a reduction in I.Q. or have behavior problems. What is the molality of a solution which contains 0.10 ppm of lead? 22) A) 4.8 × 10-10 m B) 4.8 x 10-7 m C) 4.8 x 10-1m D) 4.8 x 104 m E) None of these choices are correct. 23) Which of the following pairs of ions is arranged so that the ion with the larger (i.e., 23) more negative) heat of hydration is listed first? A) Br, Kt B) Nat, Li C) Ca2+, Sc3+ D) Mg2+, Sr 2+ E) None of these choices are correct. 24) 24) Which, if any, of the following features is common to soaps, detergents, phospholipids, and channel-forming antibiotics? A) They all contain polypeptide chains. B) Their function depends on the dual polarity of their molecules. C) They all contain fatty acids. D) They all contain phosphate groups. E) None of these choices are correct 25) 25) The chemist, Anna Lytic, must prepare 1.00 kg of 15.0% (w/w) acetic acid using a stock solution which is 36.0% (w/w) acetic acid (d-1.045 g/mL), which of the following combinations will give her the solution she wants? A) 360 mL of 36% acetic acid in 640 mL of distilled water B) 360 g of 36% acetic acid in 640 g of distilled water C) 417 g of 36% acetic acid in 583 g of distilled water D) 150 g of 36% acetic acid in 850 g of distilled water E) 417 mL of 36% acetic acid in 583 mL of distilled water

Explanation / Answer

Ans 22 : B) 4.8 x 10-7 m

The lead concentration is 10 ppm .

1 ppm = 10-6 , since it is 0.10 ppm , so it becomes 10-7

So the molality will be 4.8 x 10-7 m

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