Chemistry, 12.08.2020 05:01 Kaitneedshelps

A 3.140 molal solution of NaCl is prepared. How many grams of NaCl are present in a sample containing 2.692 kg of water

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Answer from: zayyyyy70

The mass of NaCl in 3.140 molal NaCl solution has been 494.493 grams.

Molality can be defined as the mass of solute present in 1000 grams of solvent.

Molality = $\rm \dfrac{moles\;of\;solute}{mass\;of\;solvent\;(kg)}$

The moles of NaCl has been calculated as;

3.140 = $\rm \dfrac{moles\;of\;NaCl}{mass\;of\;water\;(kg)}$

3.140 = $\rm \dfrac{moles\;of\;NaCl}{2.692\;kg}$

Moles of NaCl = 3.140 $\times$ 2.692

Moles of NaCl = 8.45288 mol

The moles can be expressed as;

Moles = $\rm \dfrac{weight}{molecular\;weight}$

Molecular weight of NaCl = 58.5 g/mol

The mass of NaCl can be calculated as:

8.45288 mol = $\rm \dfrac{mass\;of\;NaCl}{58.5\;g/mol}$

Mass of NaCl = 58.5 g/mol $\times$ 8.45288 mol

Mass of NaCl = 494.493 grams.

The mass of NaCl in 3.140 molal NaCl solution has been 494.493 grams.

For more information about molality, refer to the link;

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Answer from: kekeke68

494.49 g of NaCl.

Explanation:

Data obtained from the question include the following:

Molality of NaCl = 3.140 m

Mass of water = 2.692 kg

Mass of NaCl =.?

Next, we shall determine the number of mole of NaCl in the solution.

Molality is simply defined as the mole of solute per unit kilogram of solvent. Mathematically, it is expressed as

Molality = mole of solute /Kg of solvent

With the above formula, we can obtain the number of mole NaCl in the solution as follow:

Molality of NaCl = 3.140 m

Mass of water = 2.692 kg

Mole of NaCl =..?

Molality = mole of solute /Kg of solvent

3.140 = mole of NaCl /2.692

Cross multiply

Mole of NaCl = 3.140 x 2.692

Mole of NaCl = 8.45288 moles

Finally, we shall covert 8.45288 moles of NaCl to grams. This can be obtained as follow:

Mole of NaCl = 8.45288 moles

Molar mass of NaCl = 23 + 35.5 = 58.5 g/mol

Mass of NaCl =.?

Mole = mass /Molar mass

8.45288 = mass of NaCl /58.5

Cross multiply

Mass of NaCl = 8.45288 × 58.5

Mass of NaCl = 494.49 g.

Therefore, 494.49 g of NaCl are present in the solution.

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