One solution contains 55 g #NaCl # per liter. and another contains 55 g #KCl# per liter. Which solution has the higher molarity? How can you tell?

Answer 1

#"NaCl"# solution has the higher molarity.

The quantity of material dissolved in one liter of solution is known as molarity.

The molar masses are #"58.44 g/mol"# for #"NaCl"#, and #"74.55 g/mol"# for #"KCl"#. So the numbers of moles in each case are #"0.941 moles"# of #"NaCl"# and #"0.738 moles"# of #"KCl"#.

Volumes of solution in each case are the same, 1 litre. So #"NaCl"# has the higher molarity.

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Answer 2

Peyton Adams

NaCl solution

Since you're given the masses of each compound, all you have to do is to calculate its formula masses;
After that, find the no. of moles of each compound using the formula:

number of mol=mass/formula mass

Then find the Molarity(M) of each solution by using the formula

M=mol of solute/liters solution

Compare the results per your calculation to determine which solution has higher M.

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Answer 3

Ellie Andrews

#"Concentration"# #=# #"Number of solute particles"/"Volume of Solution"#

The number of solute particles may be determined by calculation of the molar quantities of each reagent. #NaCl# has a molar mass of #58.44# #g*mol^-1#; #KCl# has a molar mass of #74.55# #g*mol^-1#. What does this mean? It means that the given mass of stuff corresponds to a given numerical quantity of that stuff.

It is obvious that there will be more sodium chloride solute particles if equal masses of the salts are added to the same volume because sodium chloride has a smaller molar mass.

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Answer 4

Wyatt Atkins

The molarity is the same for both solutions because it depends only on the number of moles of solute per liter of solution, regardless of the identity of the solute.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.