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3 years ago

How many moles would 1.204x1024 atoms of oxygen be? (Remember Avogadro's number is 6.022x1023

Chemistry

1 answer:

Natasha2012 [34]3 years ago

7 0

Answer:

7.25 x 10^47

Explanation:

1.204 x 10^24 moles*6.022 x 10^23 avogadro's number= 7.25 x 10^47

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Answer:

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Explanation:

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3 years ago

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Describe the process of Filtration in the Nephron

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3 years ago

A barium atom attains a stable electron configuration when it bonds with

Dennis_Churaev [7]

Answer;

-Two chlorine atoms

Explanation;

A barium atom attains a stable electron configuration when it bonds with two chlorine atoms.

-Barium is an alkaline earth metal, in group two of the periodic table. Like other alkaline earth metal it has a valency of two which means it reacts by loosing two electrons.

-Chlorine on the other hand is a halogen (group seven element) it reacts by gaining an electron, thus two chlorine atoms will require two electrons. Therefore, Barium would attain a stable configuration by loosing two electrons to two chlorine atoms.

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3 years ago

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What is the mole fraction of NaOH in an aqueous solution that contains 15% NaOH by mass?

zhenek [66]

Answer:

0.074

Explanation:

15% means that in 100 g of solution 15 g sodium hydroxide is present.

Mass of water = 100 - 15 = 85 g

Number of moles of sodium hydroxide:

Number of moles = 15 g/40 g/mol

Number of moles = 0.375 mol

Number of moles of water:

Number of moles = 85 g/18 g/mol

Number of moles = 4.7 mol

Moles fraction of NaOH:

moles of NaOH/ moles of solvent + moles of solute

0.375 mol/ 0.375 mol+4.7mol

0.375 mol / 5.075 mol

0.074

6 0

4 years ago

What volume of water is needed to make up a 6.00% (m/v) solution of copper (II) sulphate when 12.0 g of it will be added to wate

8_murik_8 [283]

Answer:

200 mL of water is needed to make up a 6.00% (m/v) solution of copper (II) sulphate when 12.0 g of it will be added to water.

Explanation:

The solution is the result of the mixture between the solute, which is the substance that dissolves, and the solvent, which is the substance in which a solute dissolves. That is, a solution (or solution) is a mixture of two or more components, perfectly homogeneous since each component is intimately mixed with the other.

The concentration of solutions is the amount of solute contained in a given amount of solvent or solution. A unit of concentration is the percent weight to volume.

The percent weight to volume is the percentage ratio between the weight of the solute and the volume of the solution. It is calculated as:

$Percent =\frac{mass of solute}{volume of solution} *100$

Mass is measured in grams, while volume is measured in mL.

In this case:

Percent weight to volume= 6%
mass of solute= 12 g
volue of solution= ?

Replacing:

$6=\frac{12 g}{volume of solution} *100$

Solving:

volume of solution*6= 12 g*100

$volume of solution=\frac{12 g}{6} *100$

volume of solution= 200 mL

200 mL of water is needed to make up a 6.00% (m/v) solution of copper (II) sulphate when 12.0 g of it will be added to water

8 0

3 years ago