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3 years ago

4) I have a 52.4 g sample of lead with a volume of 10 cm3. What is its density?

Chemistry

1 answer:

ki77a [65]3 years ago

5 0

Answer:

<h2>Density = 5.24 g/cm³</h2>

Explanation:

The density of a substance can be found by using the formula

<h3> $Density = \frac{mass}{volume}$ </h3>

From the question

mass = 52.4 g

volume = 10 cm³

Substitute the values into the above formula and solve for the density

That's

<h3> $Density = \frac{52.4}{10}$ </h3>

We have the final answer as

<h3>Density = 5.24 g/cm³</h3>

Hope this helps you

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3 years ago

Calculate the. number of moles of Cu. in 8.0×1021 atoms of Cu

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Answer:

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Explanation:

The given problem will solve by using Avogadro number.

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The number 6.022 × 10²³ is called Avogadro number.

For example,

18 g of water = 1 mole = 6.022 × 10²³ molecules of water

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Given data:

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Solution:

One mole of Cu = 6.022 × 10²³ atoms

For 8.0 × 10²¹ atoms:

(1 mol / 6.022 × 10²³ atoms)×8.0 × 10²¹ atoms

1.33 × 10⁻² moles

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