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Andreas93 [3]
3 years ago
13

The proportion of dissolved substances in seawater is usually expressed in

Chemistry
1 answer:
omeli [17]3 years ago
5 0

B. Parts per thousand.

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What is the total number of moles of aluminum oxide that can be formed when 54 grams of aluminum reacts completely with oxygen?
umka2103 [35]
4Al + 3O₂ → 2Al₂O₃

m(Al)=54 g
M(Al)=27 g/mol

n(Al₂O₃)=n(Al)/2

n(Al)=m(Al)/M(Al)

n(Al₂O₃)=m(Al)/{2M(Al)}

n(Al₂O₃)=54/{2*27}= 1 mol
3 0
3 years ago
Read 2 more answers
Carbon diselenide (CSe2) is a liquid at room temperature. The normal boiling point is 125°C, and the melting point is –45.5°C. C
Tema [17]

Answer:

Explanation:  The strengths of the inter molecular forces varies as follows -

        CO_{2}< CS_{2} < CSe_{2}

The normal boiling point of CSe2 is 125°C and that of CS2 is 116°C, which explains the trend that as we move down the group, the boiling point of e compound increases as the size increases.

This usually happens because larger and heavier atoms have a tendency to exhibit greater inter molecular strengths due to the increase in size . As the size increases, the valence shell electrons move far away from the nucleus, thus has a greater tendency to attract the temporary dipoles.

And larger the inter molecular forces, more tightly the electrons will be held to each other and thus more thermal energy would be required to break the bonds between them.

5 0
3 years ago
If I have an unknown quantity of gas at a
Alekssandra [29.7K]

Answer:

2.222 that is the answer i think might want to ask

5 0
3 years ago
Which of the following UV rays has the highest energy that damages your skin the most?
Sergio [31]
The answer is b) UVB
7 0
2 years ago
Please help me answer this I will be very grateful if so :)
dimaraw [331]

The molecules in system #2 have a higher kinetic energy because they are at a higher temperature than molecules in system#1.

<h3>Heating of water molecules</h3>

Temperature is defined as a measure of the average kinetic energy of the molecules of a body. The higher the temperature of a body, the higher the kinetic energy of the molecules of the body.

In both systems, we have water molecules that have the same formula H2O. However, the molecules in system #2 have a higher kinetic energy because they are at a higher temperature than molecules in system#1.

Learn more about kinetic energy of molecules: brainly.com/question/2731193

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3 years ago
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