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LuckyWell [14K]
3 years ago
7

What is the molality of a solution that has 30mg of K3PO4 dissolved in 40mL of water? (The density of water is 1.00 g/mL)

Chemistry
1 answer:
sweet [91]3 years ago
8 0

Answer:

m = 0.0035 m.

Explanation:

Hello there!

In this case, since the formula for the computation of the molality is:

m=\frac{n_{solute}}{m_{solvent}}

We can first compute the moles of solute, K3PO4 by using its molar mass:

n=30mgK_3PO_4*\frac{1gK_3PO_4}{1000gK_3PO_4}*\frac{1molK_3PO_4}{212.27gK_3PO_4}  =1.41x10^{-4}mol

Next, since the volume of water is 40.0 mL and its density is 1.00 g/mL we infer we have the same grams (40.0 g). Thus, we obtain the following molality by making sure we use the mass of water in kilograms (0.04000kg):

m=\frac{1.41x10^{-4}mol}{0.0400kg}\\\\m=0.0035m

In molal units (m=mol/kg).

Best regards!

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What would be the mass in grams of 8.94 x 10 22 formula units of copper(II) fluoride, CuF 2
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The mass in grams of 8.94×10²² formula units of CuF₂ is 15.07 g

<h3>Avogadro's hypothesis </h3>

6.02×10²³ formula units = 1 mole of CuF₂

But

1 mole of CuF₂ = 101.5 g

Thus,

6.02×10²³ formula units = 101.5 g of CuF₂

<h3>How to determine the mass of 8.94×10²² formula units of CuF₂</h3>

6.02×10²³ formula units = 101.5 g of CuF₂

Therefore,

8.94×10²² formula units = (8.94×10²² × 101.5 ) / 6.02×10²³

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Thus, 8.94×10²² formula units are present in 15.07 g of CuF₂

Learn more about Avogadro's number:

brainly.com/question/26141731

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Sodium bicarbonate =sodium carbonate + water + carbon dioxide gas
SashulF [63]

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3 years ago
What volume of copper metal is needed to react with 3.5 moles of silver nitrate
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Problem: In each of the following situations, what type of filtration device would you use?
Shtirlitz [24]

Answer:

A. Filtration by gravity

B. Syringe filter

C. Syringe filter

D. Filtration by gravity

E. Syringe filter

F. Filtration by gravity / Vacuum filtration.

Explanation:

Filtration is a mixture of separation techniques to separate solids from liquids. The filtration can be done by gravity, by pressure or by vacuum. The correct filtration is chosen by the characteristics of the mixture.

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C. As letter B, the small volume indicates a pressure filtration by a syringe filter.

D. In this case, such as letter A, it's possible to use gravitation filtration.

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3 years ago
Calculate the percent of lead in Pb (Co3)2
velikii [3]
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7 0
3 years ago
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