1. How many grams of solute are present in 175 mL of 0.67 M glucose (C
6H
12O
6)?
0.67M/L * 0.175L * 180g/mol = 21.11g
2. How many grams of MgBr
2 should be dissolved in 275 mL of solution to produce a 0.32 M solution?
0.32M/L * 0.275L * 180g/mol = 15.84g
3. What volume of 12.4 M HCl would you need to make 500.0 mL of 3.50 M HCl?
(12.4M) * V = (0.500L)(3.50M)
V = .141 L = 14.1 mL
4. How many mL of 0.24 M KCl solution contains 0.56 g of KCl?
0.24 M * 0.56 g * 1 mol/74g = .0018 mL
5. a. Write a balanced net ionic equation for the reaction between lead (II) nitrate and cobalt (III) sulfate.
Pb
2+ + SO
42- PbSO
4b. What volume of 0.250 lead (II) nitrate is required to react completely with 23.0 mL of 0.0356 M cobalt (III) sulfate?
0.023L * 0.0356M/L * (1 mol/1 mol) * 1L/0.250M = 3.3 x 10
-3L
6. 2.488g of an impure sample of Na3PO4 are dissolved in water and all of the PO
43- ions are precipitated to give 1.796g of Ca
3(PO
4)
2. What is the percentage of Na
3PO
4 in the original sample?
*** This is the only one I'm unsure of as my professor has yet to cover it. If you could help me on this one I'd appreciate it.
Also, if you catch any error with any of the above, please let me know!
Thanks in advance!!