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3 years ago

Why is Avogadro’s number referred to as a mole? If you could change this terminology, what would you change it to and why?

1 answer:

7 0

The number of particles (molecules, atoms, compounds, etc.) per mole of a substances is known as Avagadro number. It is equal to 6.022×10^23 mol-1 and is expressed as NA.

Number of moles is the amount of a substance that contains as many particles as there are atoms in 12 grams of pure carbon-12. So, 1 mol contains 6.022×10^23 elementary entities of the substance. Since 6.022 x 10^23 is the Avagadro number, one mole is equal to Avagadro number.

One mole of a substance is the ratio of mass of the substance by the molecular mass of the substance. Thus the mass of one mole of a substance is equal to the substance's molecular weight. Thus one mole of a substance is the atomic mass unit of a substance and since one mole is equivalent to the Avagadro number,we can conclude that one Avagadro number is one atomic mass unit of the substance.

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Which of the following is true about light waves?

elena55 [62]

According to enstiens theory of relativity, c is constant in E=mc^2 c is the speed of light. and many other physicsts all calculate it to be the same amount, 299,792, 458 meters per second.

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4 years ago

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At what temperature will 0.0705 mol of Cl2 exert a pressure of 900. torr at a volume of 0.750L?

kompoz [17]

Answer:

It will exert the pressure at a temperature of 153.44 K

Explanation:

To answer this question, we shall be using the ideal gas equation;

PV = nRT

Since we are calculating the temperature, it can be made the subject of the formula.

Thus, this can be T = PV/nR

where P is the pressure = 900 torr

V is the volume = 0.75 L

n is the number of moles = 0.0705 mol

R is the molar gas constant = 62.4 L.Torr. $k^{-1}$ . $mol^{-1}$

Plugging these values into the equation, we have;

T = (900 × 0.75)/(0.0705 × 62.4)

T = 153.44 K

8 0

3 years ago

How do everyday activities like driving a car and using electricity lead to global warming

Lapatulllka [165]

Ahh. The chain reaction.
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You know when you are surfing the web, your parents tell you, or you surf the web, that you see some things like "STOP GLOBAL WARMING?"
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Yep, I have, at least.
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Well, let's see about the chain reaction...
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You see, where does our energy come from?
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Yes, windmills and solar cells...
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but also nuclear and power plants, no?
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The power plants emit carbon dioxide that contribute to global warming.
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Now, cars do the same. One car may not seems like a lot of carbon dioxide...
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But... this many cars multiplied by 9 trillion times 9 trillion and much more... is...


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Well, you know the difference.
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They contribute to global warming over a period of time, slowly, because they emit carbon monoxide/dioxide.

4 0

3 years ago

In a blast furnace, iron(III) oxide is used to produce iron by the following (unbalanced) reaction: Fe2O3 + CO---------->Fe +

rewona [7]

Answer:

a) The no. of moles of CO are needed = 75.15 mol.

b) The no. of moles of Fe are produced = 50.1 mol.

The no. of moles of CO₂ are needed = 75.15 mol.

Explanation:

Firstly, we need to write the balanced reaction:

Fe₂O₃ + 3CO → 2Fe + 3CO₂,

It is clear that 1 mol of Fe₂O₃ reacts with 3 mol of CO to produce 2 mol of Fe and 3 mol of CO₂.

a) If 4.00 kg Fe₂O₃ are available to react, how many moles of CO are needed?

We need to calculate the no. of moles of 4.00 kg Fe₂O₃:

n = mass/molar mass = (4000 g)/(159.69 g/mol) = 25.05 mol.

Using cross multiplication:

1 mol of Fe₂O₃ need → 3 mol of CO to react completely, from stichiometry.

25.05 mol of Fe₂O₃ need → ??? mol of CO to react completely.

∴ The no. of moles of CO are needed = (3 mol)(25.05 mol)/(1 mol) = 75.15 mol.

b) How many moles of each product are formed?

To find the no. of moles of Fe formed:

Using cross multiplication:

1 mol of Fe₂O₃ produce → 2 mol of Fe, from stichiometry.

25.05 mol of Fe₂O₃ produce → ??? mol of Fe.

∴ The no. of moles of Fe are produced = (2 mol)(25.05 mol)/(1 mol) = 50.1 mol.

To find the no. of moles of CO₂ formed:

Using cross multiplication:

1 mol of Fe₂O₃ produce → 3 mol of CO₂, from stichiometry.

25.05 mol of Fe₂O₃ produce → ??? mol of CO₂.

∴ The no. of moles of CO₂ are needed = (3 mol)(25.05 mol)/(1 mol) = 75.15 mol.

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3 years ago

If you travel 10 miles in 5 minutes, what is your speed

xenn [34]

Answer: 120 mph or 2 mpm

Explanation: 60/5= 12

12*10=120mph

Going 10 miles in 5 minutes means you would be able to go 20 miles in 10 minutes. You would have a total of 12 five minute blocks at 10 miles each. 60 miles in 30 minutes or 120 in 60 minutes.

Or 10 miles in 5 minutes would be 2 miles in 1 minute. (10/5=2)

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3 years ago