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maksim [4K]
3 years ago
15

What mass of sucrose needs to be dissolved into 540. G of water in order to prepare a 15% by mass solution? ______g sucrose

Chemistry
1 answer:
beks73 [17]3 years ago
8 0

Answer:

Mass of Sucrose = 95.29 grams.

Explanation:

Given,

Mass percent = 15%

 Mass of Water = 540 grams

Mass of Sucrose = ?

Mass percent of a solution can be calculated using the formula,

Mass percent =  (Mass of Solute/Mass of Solution)*(100)

In this solution, Sucrose is solute and water is the solvent.

As the solution contains both Sucrose and Water,

Mass of Solution = mass of solute + mass of solvent = mass of sucrose + 540.

Let mass of sucrose(solute) = 'x' grams.

Therefore, mass of solution = x + 540.

Substituting the values in the formula, we get,

15 = (x/x+540)*(100) =>  (x/x+540) = (15/100)

=>  (x/x+540) = 0.15 => x = 0.15x + 81 => 0.85x = 81 => x = 95.29 grams.

Therefore, Mass of Sucrose = 95.29 grams.

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How many atoms of titanium are there in 0.670 moles of FeTiO3
TiliK225 [7]

4.03 x 10²³ atoms

Explanation:

Given parameters:

Number of moles of FeTiO₃  = 0.67moles

Unknown:

Number of atoms = ?

Solution:

From the compound  FeTiO₃ ;

     1 mole of  FeTiO₃ contains 1 mole of Ti atom

   0.67 moles of  FeTiO₃  will invariably have 0.67 moles of Ti atoms

A mole of any substance is the quantity of substance that contains the Avogadro's number of particles 6.02 x 10²³ particles

The particles are number of atoms, number of protons, neutrons, electrons, molecules e.t.c

      1 mole of Ti = 6.02 x 10²³  atoms of Ti

       0.67 moles of Ti = 0.67 x  6.02 x 10²³  = 4.03 x 10²³ atoms

learn more:

Number of atoms brainly.com/question/10419836

#learnwithBrainly

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elixir [45]
Using P1V1/T1 = P2V2/T2, 1 being the conditions initially and 2 being the secondary conditions…. always make sure you convert you units first , L=695.8262L

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Explanation:

3 0
3 years ago
Read 2 more answers
3Fe + 4H2O Fe3O4 + 4H2
aalyn [17]
<span>These are five questions with its five answers.
</span><span>
</span><span>
</span><span>First, we have to explain main question.
</span>
<span /><span /><span>
</span><span>The statement provides the chemical equation for the reaction of Fe with water to produce iron(III) oxide and hydrogen.
</span>
<span /><span /><span>
</span><span>Fe3O4 is a weird chemical formula. It belongs to the product named oxoiron.
</span>
<span /><span /><span>
Next, I have to tell how you must interpret the question. The five questions are based on the complete reaction of the same number of moles as the coefficients indicated in the chemical equation.
</span><span />

<span>Those coefficients are 3 for Fe, 4 for H₂O, 1 for Fe₃O₄ and 4 for H₂.


With that understood, let's work every question.


1) How many molecules of H₂ are produced?


Answer: 4 moles of molecules.

</span><span>Justification:
</span>

<span /><span /><span>This is, the number of moles of H₂ produced is given by the coefficient indicated in the chemical equation.
</span><span />

<span>2) How many oxygen atoms are required?
</span><span />

<span>Answer: 4.

</span><span>This is, the atoms of oxygen are supplied in the molecules of water. Since the coeffcient of water is 4, and each molecule o fwater has 1 atom of oxygen, 4 moles of water contain 4 moles of atoms of oxygen.
</span>
<span /><span /><span>
3) How many moles of Fe₃O₄ are formed?
</span><span />

<span>Answer: 1.
</span><span />

<span>Justification: the coefficient of for formula Fe₃O₄ is 1, indicating that the theoretical yield is 1 mol of molecules.
</span><span />

<span>4) What is the mole ratio of Fe to H₂O?
</span><span />

<span>Answer: 3:4
</span><span />

<span>Justification:
</span><span>
</span><span>
</span><span>The ratio is the quotient of the two coefficients: the coefficient of the Fe divided by the coefficient of the H₂O.
</span>
<span /><span /><span>
5) How many hydrogen atoms are involved in this reaction?
</span><span />

<span>Answer: 8 moles of hydrogen atoms.
</span><span />

<span>Justification: as you can see each molecule of H₂O has 2 atoms of hydrogen, then 4 moles of molecules of H₂O have 8 moles of atoms of hydrogen. And of course the same number are in the produt: 4 moles of H₂ contain 8 moles of atomos of hydrogen
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3 0
3 years ago
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