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3 years ago

The best method for seperating a salt from water is

Chemistry

2 answers:

igor_vitrenko [27]3 years ago

7 0

Answer:

The answer is 1-boiling

Explanation:

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abruzzese [7]3 years ago

6 0

Answer:1 Boiling

Explanation:

Salt (Solute) + water (solvent) = Solution.

Salt dissolves in water, therefore, the only way to recover the salt is by boiling (evaporation) the solution.

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15% by volume of blood your brain gets at rest. Your body contains 5.2 L of blood, how many liters of blood are in your brain at

REY [17]

Answer: 0.8242182 quarts of blood will be present in the brain at rest.

Solution:

According to question: 15% by volume of blood your brain gets at rest

if we are having 5.2 L of blood in our body , then blood present in our brain at rest:

$15\%\text{of the 5.2 L of blood}=(5.2 L)\times \frac{15}{100}=0.78 L$

if 1 L= 1.05669 quart

Then 0.78 L will be =0.78 L $\times$ 1.05669 quart = 0.8242182 quarts

0.8242182 quarts of blood will be present in the brain at rest.

8 0

3 years ago

The mass of a 50-mL volumetric flask is 40.638 g. After adding 15.0 mL of 95% ethanol and adding enough water to complete the vo

Nuetrik [128]

Answer

0.9516 grams / mL (50.00 has 4 sig digs.)

Remark

You have a couple of extraneous numbers there. You don't care about anything except the mass of the flask + water/alcohol mixture (88.219 grams). and the mass of the flask (40.638 grams)

Formulas

mass water/alcohol mixture = mass of the flask with fluid - mass flask
density = mass / volume

Solution

mass water/alcohol mixture = 88.219 - 40.638 = 47.581

Volume = 50 mL
Density = mass / Volume
Density = 47.581/50
Density = 0.95162 There are 4 sig digs so the answer should be
0.9516

3 0

3 years ago

It takes 167 s for an unknown gas to effuse through a porous wall and 99 s for the same volume of n2 gas to effuse at the same t

irakobra [83]

Answer : The molar mass of the unknown gas will be 79.7 g/mol

Explanation : To solve this question we can use graham's law;

Now we can use nitrogen as the gas number 2, which travels faster than gas 1;

So, 167 / 99 = 1.687 So the nitrogen gas is 1.687 times faster that the unknown gas 1

We can compare the rates of both the gases;

So here, Rate of gas 2 / Rate of gas 1 = $\sqrt{(molar mass 1 / molar mass 2)}$

Now, 1.687 = square root [ $\sqrt{(molar mass 1) / (28.01 g/mol N_{2})}$ ]

When we square both the sides we get;

2.845 = (molar mass 1) / (28.01 g/mol N2)

On rearranging, we get,

2.845 X (28.01 g/mol N2) = Molar mass 1

So the molar mass of unknown gas will be = 79.7 g/mol

3 0

3 years ago

As part of a soil analysis on a plot of land, a scientist wants to determine the ammonium content using gravimetric analysis wit

jeka94

Answer:

Mass percentage of NH₄Cl = 3.54%

Mass percentage of K₂CO₃ = 1.01%

Explanation:

If a 200.0 mL aliquot produced 0.105 g of KB(C₆H₅)₄, then a 100.0 mL aliquot would produce 1/2 * 0.105 g = 0.0525 g of KB(C₆H₅)₄.

Therefore, mass of NH₄B(C₆H₅)₄ in the 100.0 ml aliquot = (0.277 - 0.0525)g = 0.2245 g

Number of moles of NH₄B(C₆H₅)₄ in 0.2245 g = 0.2245 g/ 337.27 g/mol = 0.0006656 moles

In 500 ml solution, number of moles present = 0.0006656 * 500/100 = 0.003328 moles.

From equation of the reaction; mole ratio of NH₄⁺ and NH₄B(C₆H₅)₄ = 1:1

Similarly, mole ratio of NH₄⁺ and NH₄Cl = 1:1

Therefore, moles of NH₄Cl in 500 ml sample = 0.003328 moles

Mass of NH₄Cl = 0.003328 mol * 53.492 g/mol = 0.178 g

Mass percentage of NH₄Cl = (0.178/5.025) * 100% = 3.54%

Number of moles of KB(C₆H₅)₄ in 0.105 g (precipitated from 200.0 ml aliquot) = 0.105 g/ 358.33 g/mol = 0.000293 moles

In 500 ml solution, number of moles present = 0.000293 * 500/200 = 0.0007326 moles.

From equation of the reaction; mole ratio of K⁺ and KB(C₆H₅)₄ = 1:1

Similarly, mole ratio of K⁺ and K₂CO₃ = 2:1

Therefore, moles of K₂CO₃ in 500 ml sample = 0.0007326/2 moles = 0.0003663 moles

Mass of K₂CO₃ = 0.0003663 mol * 138.21 g/mol = 0.05063 g

Mass percentage of K₂CO₃ = (0.05063/5.025) * 100% = 1.01%

7 0

3 years ago

How many bonds does CIO3- have, the chlorate ion have?

chubhunter [2.5K]

2 ions in that solution.

7 0

3 years ago