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3 years ago

The periodic table was developed based upon the work of which scientist?

2 answers:

8 0

Mendeleev organized and constructed the periodic table of elements. And ordered the elements into increasing atomic number.

sveticcg [70]3 years ago

5 0

C. Moosely
It is the Answer to your question.

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The composition of a compound is 20.01% carbon and 79.99% oxygen by mass. what is its empirical formula?

Anni [7]

Assume there are 100g of the compound.
Mass of carbon:20.01g
Mass of oxygen:79.99g
Number of mole of carbon:20.01/12=1.6675mol
Number of mole of oxygen:79.99/32=2.4996875mol
Mole ratio between carbon and oxygen:
1.6675/1.6675:2.4996875/1.6675
=1:1.499062969
1x2:1.499062969x2
=2:2.998125937
≈2:3
Hence, the empirical formula:
C2O3

5 0

3 years ago

Fluorine is a gas and iodine is a solid, yet all halogens are non-polar and would interact with London dispersion forces. This i

attashe74 [19]

Answer:

the molecules of each substance attract each other through dispersion (London) intermolecular force.whether a substance is solid, liquid or gas depends on the balance between the kinetic energies of the molecules and their intermolecular attractions.

thank you.

6 0

3 years ago

Which statement correctly describes cellular respiration

IRISSAK [1]

Answer:

It is the release of stored chemical energy in food to produce ATP.

8 0

2 years ago

What are three things that the elements Magnesium, Calcium and Barium have in common?

Volgvan

Answer:

1.They are all in the second group of the periodic table

2.They are an alkaline earth metal

3.They all have a shine to them

4.They are all highly reactive

5.They have a silver/white to them

6.They can all be found in the Earths crust

I'm not really sure of any others that they have in common and I thought to give extra so you could choose.

6 0

3 years ago

Part B When carbon is burned in air, it reacts with oxygen to form carbon dioxide. When 22.8 g of carbon were burned in the pres

aksik [14]

<u>Answer:</u> The amount of carbon dioxide gas produced in the reaction is 83.6 grams

<u>Explanation:</u>

As, some amount of oxygen gas is left after the reaction is completed. So, it is present in excess and is considered as an excess reagent.

Thus, carbon is considered as a limiting reagent because it limits the formation of product.

To calculate the number of moles, we use the equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$ .....(1)

Given mass of carbon = 22.8 g

Molar mass of carbon = 12 g/mol

Putting values in equation 1, we get:

$\text{Moles of carbon}=\frac{22.8g}{12g/mol}=1.9mol$

The chemical equation for the reaction of carbon and oxygen gas follows:

$C+O_2\rightarrow CO_2$

By Stoichiometry of the reaction:

1 mole of carbon produces 1 mole of carbon dioxide gas

So, 1.9 moles of carbon will produce = $\frac{1}{1}\times 1.9=1.9moles$ of carbon dioxide gas

Now, calculating the mass of carbon dioxide from equation 1, we get:

Molar mass of carbon dioxide = 44 g/mol

Moles of carbon dioxide = 1.9 moles

Putting values in equation 1, we get:

$1.9mol=\frac{\text{Mass of carbon dioxide}}{44g/mol}\\\\\text{Mass of carbon dioxide}=(1.9mol\times 44g/mol)=83.6g$

Hence, the amount of carbon dioxide gas produced in the reaction is 83.6 grams

6 0

2 years ago