Question
1. A 0.0250 g sample containing cyanide (26.02 g/mol) was dissolved in a given solvent. After addition of the AgNO3 (169.87 g/mol), a 0.0125 g
1. A 0.0250 g sample containing cyanide (26.02 g/mol) was dissolved in a given solvent. After addition of the AgNO3 (169.87 g/mol), a 0.0125 g of AgCN (133.89 g/mol) was obtained. What is the percent of cyanide in the sample?
- 9.72%
- 7.64%
- 1.91%
-19.5%
2. A 0.8870 g sample containing only NaCl (58.45 g/mol) and KCl (74.55 g/mol) was treated with AgNO3. The AgCl (143.32 g/mol) formed had a mass of 1.913 g. Calculate the mass of NaCl and KCl in the sample.
- NaCl = 0.4375 g and KCl = 0.4495 g
- NaCl = 0.4435 g and KCl = 0.4435 g
- NaCl = 0.3914 g and KCl = 0.4952 g
- NaCl = 0.2650 g and KCl = 0.6220 g
3. A 0.8870 g sample containing only NaCl and KCl was treated with AgNO3. The AgCl (143.32 g/mol) formed had a mass of 1.913 g. Calculate the mass of chloride (35.45 amu) in the sample.
- 0.473 g
- 1.913 g
- 1.2355 g
- 1.678 g
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