Molality, Percent Composition, and PPM Problems
1.
What is the molality of a solution that contains 63.0 g HNO3 in 0.500 kg H2O?
2.
What is the molality of a solution that contains .500 mol HC2H3O2 in 0.125 kg H2O?
3.
What mass of water is required to dissolve 100. g NaCl to prepare a 1.50 m solution?
4.
What mass of water must be used to dissolve 0.500 kg C2H5OH to prepare a 3.00 m solution?
5.
What mass of H2SO4 must be dissolved to 2.40 kg H2O to produce a 1.20 m solution?
6.
What is the molality of a solution that contains 80.0 g Al2(SO4)3 in 625 g H2O?
7.
What mass of water is required to dissolve 175 g KNO3 to produce a 2.25 m solution?
8.
What mass of HC2H3O2 must be dissolved in 800. g H2O to produce a 6.25 m solution?
9.
What is the percent composition of salt in a 300g solution containing 40.0 g of salt?
10. A 2000g solution of Kool-Aid contains 1.5g of powder. What is the percent composition of powder in the Kool-Aid?
11. What is the percent composition of a 290g glass of lemonade containing 10g of sugar?
12. A 10g sample of blood contains 1.2g of sodium. What is the % composition of sodium?
13. What is the % composition of 12g of lime juice in 50g of limeade?
14. A 34g sample of CuSO4 was added to make 67g of solution. What is the % composition?
15. How many grams of H2SO4 must be inside a 320g solution if it is a 35% solution?
16. How many grams of CO2 gas must be inside a 1.4% solution of carbonated water weighing 90g?
17. How many grams of O2 must be within 50g of 10% solution of oxygenated water?
18. 35g of sugar is added to a pot of water weighing 1000g which is used to make coffee. What is the % composition of sugar in the coffee?
19. How many ppm of radon gas exist if there are 5g in a room containing 34,719g of air?
20. A lake containing 1320g of lead in 31,243,500g of water has what ppm for lead?
21. 50g of a chemical is spilled into a water tower holding 230,000g of water. The concentration in ppm is?
22. 300g of water contains 1.00 g of PCl5. How many ppm is this?
23. 203,450,000g of water in a lake is contaminated with 326g of anthrax. How many ppm?
24. 12,350g in a pool contains 4g of NaBr. What is the ppm concentration of NaBr?
25. What is the ppm concentration of 370g of HCN gas inside 123,490g of air?
26. What is the ppm concentration of 35.0g of deadly Sintox nerve gas mixed with 609,876,000g of air?
27. If the concentration of 56.8g of CO2 gas is 7.9 ppm, how many grams of air are present?
28. How many g of HCl when added to 45,615g of water give a ppm concentration of 3.1?