Chemistry
04.04.2022 17:55
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The concentration of KBr in a solution prepared by dissolving 2.21g of KBr in 897
The concentration of KBr in a solution prepared by dissolving 2.21g of KBr in 897 g of water is m.
A) 2.46.
B) 0.0167.
C) 2.07 x 10-5.
D) 0.0186.
E) 0.0207.
Show Answers
B) 0.0167.
C) 2.07 x 10-5.
D) 0.0186.
E) 0.0207.
jae222
4,5(15 marks)
E) 0.0207
Explanation:
The molal concentration, m, is defined as the ratio between moles of solute (In this case, KBr) per kg of solvent (water):
Moles KBr -Molar mass: 119g/mol-
2.21g KBr * (1mol / 119g) = 0.01857moles
Mass solvent:
897g * (1kg / 1000g) = 0.897kg
Molal concentration:
0.01857 moles / 0.897kg =
0.0207m
Right solution is:
E) 0.0207.
Calebmf9195
4,9(15 marks)
Ummm the last one (I think)
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