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24.
For analyzing the concentration of lead in drinking water samples, a chemist needs to make 600 ml
of 0.1 M potassium bromide (KBr, molar mass=119 g/mole). Which of the following is the most
accurate determination of the mass of KBr that he needs to weigh out?

A5.04 g
B.3.0g
C. 7.1g
D. 11.9g

Maria wants to determine which type of disinfectant kills the most bacteria. which of the following is the best way for maria to determine this? a. ask ten different companies that make disinfectants which type is best. b. put the same amount and species of bacteria on ten identical plates, and add ten different kinds of disinfectant to each plate. c. interview ten different people to determine which type of disinfectant they prefer. d. put the same amount and species of bacteria on ten identical plates, and add a different disinfectant to each plate.

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If 10.5 l of a at 0.98to 1.50 , is ?