1) Complete the following table for NH3 (17.03 g/mol) solution:
|
Density of Solution
(g/ml)
|
Molarity
(mol/L)
|
Molality
(mol/ kg solv.)
|
%wt
|
ppm
|
|
a) 0.996
|
|
|
|
|
|
b) 0.936
|
|
|
|
|
2) Treatment of a 1.000g sample of a mixture of soluble chlorides with an excess of AgNO3 resulted in the formation of 2.592g of AgCl (143.32g/mol).
a) What is the weight percent of Cl-(35.453g/mol) in the sample?
b) If this sample contains only NaCl (58.443g/mol) and MgCl2 (95.211g/mol), calculate the weight percent of NaCl and MgCl2 in the sample.
3) A combustion analysis of 0.1801g sample of an organic compound known to contain just C, H, and O gave 0.03603g H2O, and the CO2 produced was collected in a solution of barium hydroxide. After reaction was complete, 0.7894g BaCO3 (197.34g/mol) was formed.
a) Calculate %wt of C, H, and O in the compound .(H: 1.008; C: 12.011; O: 16.000)
b) Find the empirical formula of this compound.