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What is the molarity of an 18 L solution containing 64 grams of sodium chloride (NaCl) dissolved in it? (Molar mass of NaCl = 58.44 g/mol)
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6. Chemical Quantities & Aqueous Reactions
Molarity
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Which of the following is the best way to represent the concentration of a 1.75 m K2CrO4 solution?
A
1.75 mol K2CrO4 per liter of solution
B
1.75 mol K2CrO4 per kilogram of solvent
C
1.75 g K2CrO4 per kilogram of solvent
D
1.75 g K2CrO4 per liter of solution
Guida verificata passo dopo passo1
Understand the difference between molarity and molality: Molarity (M) is defined as moles of solute per liter of solution, while molality (m) is defined as moles of solute per kilogram of solvent.
Recognize that the problem states the concentration as 1.75 m K2CrO4, where the lowercase 'm' denotes molality, not molarity.
Recall that molality is expressed as moles of solute per kilogram of solvent, so the correct representation must involve moles of K2CrO4 per kilogram of solvent.
Evaluate the given options and identify that '1.75 mol K2CrO4 per kilogram of solvent' matches the definition of molality.
Conclude that the best way to represent the concentration of a 1.75 m K2CrO4 solution is using molality units, which is moles of solute per kilogram of solvent.
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