A student needs to make #5.00xx10^1# mL of a potassium carbonate solution with a concentration of #3.3000xx10^(-2)# mol/L. What mass of potassium carbonate should they use to make the solution? (Answer to 3 s.d. in g)

Answer 1

We need a mass of #228*mg# of #"potassium carbonate"#...........

We use the relationship #"Concentration"="Moles of solute"/"Volume of solution"#.
And thus #"moles of solute"="concentration"xx"volume".......#

Thus, let's go ahead.

#"moles"=50*mLxx10^-3L*mL^-1xx3.30xx10^-2*mol*L^-1#
#=1.65xx10^-3*mol#.

which is equivalent to a mass of...

#=1.65xx10^-3*cancel(mol)xx138.21*g*cancel(mol^-1)=0.228*g#.
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Answer 2

To calculate the mass of potassium carbonate needed, you can use the formula:

mass = volume (in liters) * concentration (in mol/L) * molar mass (in g/mol)

Given: Volume = 5.00 × 10^1 mL = 5.00 × 10^1 mL / 1000 mL/L = 0.0500 L Concentration = 3.3000 × 10^(-2) mol/L Molar mass of potassium carbonate (K2CO3) = 2(39.10 g/mol) + 12.01 g/mol + 3(16.00 g/mol) = 138.21 g/mol

Now, plug the values into the formula:

mass = 0.0500 L * 3.3000 × 10^(-2) mol/L * 138.21 g/mol mass ≈ 2.292 g

Therefore, the mass of potassium carbonate needed to make the solution is approximately 2.292 grams (to 3 significant figures).

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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.

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.

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.

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.

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