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3 years ago

A bar of copper has a mass of 216g and a volume of 24cm^3. What is the density of copper?

Chemistry

1 answer:

7nadin3 [17]3 years ago

3 0

Answer:

<h2>The answer is 9 g/cm³</h2>

Explanation:

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

$density = \frac{mass}{volume} \\$

From the question

mass = 216 g

volume = 24 cm³

The density is

$density = \frac{216}{24} \\$

We have the final answer as

Hope this helps you

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<u>Explanation:</u>

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$\text{Molarity of the solution}=\frac{\text{Moles of solute}\times 1000}{\text{Volume of solution (in mL)}}$ .....(1)

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Molarity of KOH solution = 1.1000 M

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Putting values in equation 1, we get:

$1.1000M=\frac{\text{Moles of KOH}\times 1000}{41.04}\\\\\text{Moles of KOH}=\frac{1.1000\times 41.04}{1000}=0.04514mol$

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Putting values in equation 1, we get:

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$C_2H_5COOH+KOH\rightarrow C_2H_5COOK+H_2O$

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<u>Final:</u> 0.09206 - 0.04514

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$pH=pK_a+\log(\frac{[\text{salt}]}{[acid]})$

$pH=pK_a+\log(\frac{[C_2H_5COOK]}{[C_2H_5COOH]})$

We are given:

$pK_a$ = negative logarithm of acid dissociation constant of propanoic acid = 4.89

$[C_2H_5COOK]=\frac{0.04514}{0.26594}$

$[C_2H_5COOH]=\frac{0.09206}{0.26594}$

pH = ?

Putting values in above equation, we get:

$pH=4.89+\log(\frac{(0.04514/0.26594)}{(0.09206/0.26594)})\\\\pH=4.58$

Hence, the pH of acid solution is 4.58

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