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3 years ago

What are molecules and what are they made of?

Chemistry

1 answer:

aalyn [17]3 years ago

5 0

Molecules are substances which consist of atoms chemically combined by chemical bonds

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A solution is prepared by mixing 525 mL of ethanol with 597 mL of water. The molarity of ethanol in the resulting solution is 8.

Alenkinab [10]

Answer:

$\Delta V = 234.736\,mL$

Explanation:

The quantity of moles of ethanol in the solution is:

$n_{C_{2}H_{5}OH} = \left(\frac{597\,mL}{1000\,mL} \right)\cdot \left(8.35\,\frac{mol}{L} \right)$

$n_{C_{2}H_{5}OH} = 4.985\,mol$

The mass and volume of ethanol in the solution are, respectively:

$m_{C_{2}H_{5}OH} = (4.985\,mol)\cdot \left(46.07\,\frac{g}{mol} \right)$

$m_{C_{2}H_{5}OH} = 229.658\,g$

$V_{C_{2}H_{5}OH} = \frac{229.658\,g}{0.7893\,\frac{g}{mL} }$

$V_{C_{2}H_{5}OH} = 290.964\,mL$

The difference between the total volume of water and ethanol mixed to prepare the solution and the actual volume of solution is:

$\Delta V = (525\,mL+597\,mL) - (597\,mL + 290.964\,mL)$

$\Delta V = 234.736\,mL$

8 0

3 years ago

1. Estuaries may be either brackish or<br> freshwater systems.<br> True<br> O False

zzz [600]

Answer:

False - Estuaries are formed due to both brackish and freshwater.

Explanation:

Hope this Helps!!!

4 0

4 years ago

When forming ions, both gallium and sulfur take on the same electron configuration as what element

guapka [62]

Answer:

GaS

Explanation:

GaS is Gallium and Sulfuric Acid.

Melting point = 965°C

Appearance: Yellow crystal

Density: 3.86 g / cm³

I hope this helps you :)

8 0

3 years ago

I need help with this science question that I didn't do yesterday and is now missing can you help? Convection (____________ of t

JulijaS [17]

Conduction is the answer to ur question

3 0

3 years ago

Why do not all rock types contain fossils?

nata0808 [166]

Answer:

Igneous rocks form from molten rock, and rarely have fossils in them. Metamorphic rocks have been put under great pressure, heated, squashed or stretched, and fossils do not usually survive these extreme conditions. Generally it is only sedimentary rocks that

Explanation:

Hope it helps, some how.

Your welcome :)

6 0

3 years ago