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Ilia_Sergeevich [38]

3 years ago

14

A marathon is a race that commemorates the run made by a Greek soldier, Pheidippides, that took place in August 490 BC. The sold

ier ran 26.2 mi. How many kilometers did he run?

2 answers:

Vlad1618 [11]3 years ago

7 0

The correct answer is 42. All marathon races in Europe are 42km long, which is 26.2 miles for those who use miles.

timofeeve [1]3 years ago

5 0

the correct answer to this problem is <u>41.9 </u> to be exact

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marin [14]

Answer:

$\large \boxed{1.447 \times 10^{23}\text{ molecules Cu(OH)}_{2 }}$

Explanation:

1. Calculate the moles of copper(II) hydroxide

$\text{Moles of Cu(OH)}_{2} = \text{23.45 g Cu(OH)}_{2} \times \dfrac{\text{1 mol Cu(OH)}_{2}}{\text{97.562 g Cu(OH)}_{2}} = \\\\\text{0.240 36 mol Cu(OH)}_{2}$

2. Calculate the molecules of copper(II) hydroxide

$\text{No. of molecules} = \text{0.240 36 mol Cu(OH)}_{2} \times \dfrac{6.022 \times 10^{23}\text{ molecules Cu(OH)}_{2}}{\text{1 mol Cu(OH)}_{2}}\\\\= 1.447 \times 10^{23}\text{ molecules Cu(OH)}_{2}\\\text{The sample contains $\large \boxed{\mathbf{1.447 \times 10^{23}}\textbf{ molecules Cu(OH)}_{\mathbf{2}}}$}$

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3 years ago

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Romashka-Z-Leto [24]

Answer:

either first or second if not them try d but I'm pretty sure a also I'm sorry if I getbyou this wrong I dearly apologize

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2 years ago

5pts. Chemistry multiple choice

aleksandrvk [35]

Answer:

C. Xenon

Explanation:

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Mnenie [13.5K]

I think it’s A sorry if i’m wrong

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2 years ago

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damaskus [11]

Answer:

I believe

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2 years ago