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weqwewe [10]
3 years ago
9

What is the density of a block with a mass of 36 g and a volume of 9 cm3?

Chemistry
1 answer:
Sergio039 [100]3 years ago
3 0

Answer:

The answer is

<h2>4.0 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 of block = 36 g

volume = 9 cm³

The density is

density =  \frac{36}{9}

We have the final answer as

4.0 g/cm³

Hope this helps you

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Answer: There are 7.4 moles of helium gas present in a 1.85 liter container at the same temperature and pressure.

Explanation:

Given: V_{1} = 2.25 L,     n_{1} = 9.0 mol

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Formula used to calculate the moles of helium are as follows.

\frac{V_{1}}{n_{1}} = \frac{V_{2}}{n_{2}}\\

Substitute the values into above formula as follows.

\frac{V_{1}}{n_{1}} = \frac{V_{2}}{n_{2}}\\\frac{2.25 L}{9.0 mol} = \frac{1.85 L}{n_{2}}\\n_{2} = \frac{1.85 L \times 9.0 mol}{2.25 L}\\= 7.4 mol

Thus, we can conclude that there are 7.4 moles of helium gas present in a 1.85 liter container at the same temperature and pressure.

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