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Vaselesa [24]
3 years ago
12

How many mL of a 4.50 (m/v)% solution would contain 23.0 g of solute?

Chemistry
2 answers:
nlexa [21]3 years ago
4 0
23.0 g/ (4.50 g/ mL) gives 5.11 mL as the volume.
Helen [10]3 years ago
3 0

<u>Answer:</u> The given amount of solute will be present in 511.11 mL of solution.

<u>Explanation:</u>

We are given:

Concentration of solution = 4.50 (m/v) %

This means that 4.50 grams of solute is present is 100 mL of solution.

We need to find the volume of solution that can contain 23.0 grams of solute.

By applying unitary method, we get:

4.50 grams of solute is present in 100 mL of solution.

So, 23.0 grams of solute will be present in = \frac{100mL}{4.50g}\times 23.0=511.11mL of solution.

Hence, the given amount of solute will be present in 511.11 mL of solution.

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How many times a one pound (2.2 kg) block of iron can be split in half before it stops being iron.
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= 84.29 times

Explanation:

Atoms : It is the smallest indivisible particle of the matter .

The atom can not be further breakdown .

Here in this question , we have to find the number of atoms (because it is the last possible situation for breaking of atom)

Mole : The quantity of the substance that contain as many particles as present in 12 g of C-12.It is quantity which Avogadro number(N0) of particles

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<u>1.First calculate the number of moles of Fe in 2.2Kg Block</u>

Mass of  Iron (Fe) = 55.845 amu

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Given mass = 2.2 kg

1 kg = 1000 g

2.2 kg = 2200 g

moles = \frac{given\ mass}{Molar\ mass}

moles = \frac{2200}{55.845}Moles of Fe  = 39.39 2.Calculate the number of particles of Fe in 39.39 moles of  Block[tex]moles = \frac{Number\ of\ Particles}{Avogadro\ number}

Avogadro\ number = 6.022\times 10^{23}

moles = 39.39

39.39 = \frac{Number\ of\ Particles}{N_{0}}

Number\ of\ Particles=39.39\times 6.022\times 10^{23}

Number\ of\ Particles= 2.37\times 10^{25}

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<u>3.Calculate Number of time(n), the block is </u><u>split into -Half </u>

2^{n}=2.37\times 10^{25}

Take log both side ,

n\ log2 = log(2.37\times 10^{25})

Solve for n, you get

n= 84.29 (convert it to nearest whole number)

n = 84 times

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