August 2018 NY Regents Chemistry Exam
40 A solution is prepared using 0.125 g of glucose, C6H12O6, in enough water to make 250. g of total solution. The concentration of this solution, expressed in parts per million, is
(1) 5.00 × 10^1 ppm
(2) 5.00 × 10^2 ppm
(3) 5.00 × 10^3 ppm
(4) 5.00 × 10^4 ppm
Solution: Table T on the Reference table gives a formula for calculating concentration expressed in parts per million. Parts per million = (mass of solute/ mass of solution)*1000000
Parts per million = (0.125 g/ 250. g )*1000000 = 500
Answer:2
Prepare for the Chemistry Regents Exam: HERE
Contact us for chemistry tutoring: HERE