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lina2011 [118]
3 years ago
7

What is the number of moles of solute in 250mL of a 0.4M solution?

Chemistry
1 answer:
lana66690 [7]3 years ago
7 0

There are 0.1 moles of solute in 250 mL of 0.4 M solution.

Explanation:

First, recognize that the molar concentration tells you how many moles of the solute are present in one liter of solution. In a 0.4 M solution, there are 0.4 moles of solute in every liter of solution. You can determine the number of moles of solute in 250 mL of the solution using dimensional analysis.

250mL⋅

1L/1000mL⋅

0.4mol1L

Units of liters and milliliters cancel, leaving you with a final answer in units of moles, at 0.1 mol.

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Explanation:

First, let's calculate the moles of each reactant with the following expression:

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Now, let's write the equation that it's taking place. If it's neccesary, we will balance that.

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As you can see, 0.04 moles of  K2CO3 will react with only 0.004 moles of Ba(NO3) because is the limiting reactant. Therefore, you'll have a remanent of

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These moles are in total volume of 50 mL (30 + 20 = 50)

So finally, the concentration of Ba in solution will be:

[Ba] = 0.008 / 0.050 = 0.160 M

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