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laiz [17]
1 year ago
14

If 7.50 g of the unknown compound contained 0.250 mol of c and 0.500 mol of h, how many moles of oxygen, o, were in the sample?

Chemistry
1 answer:
Mice21 [21]1 year ago
3 0
It would be 100.60 because we're adding like to the atmosphere it connects to lubricator and then it turns so that's 100.60
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In a lab, 33 g of potassium chloride is formed from 60.0 g of potassium chlorate decomposing. Calculate the theoretical yield an
Svetlanka [38]

Answer: The theoretical yield and percent yield for this experiment are 40 g and 82% respectively.

Explanation:

2KClO_3\rightarrow 2KCl+3O_2

According to avogadro's law, 1 mole of every substance weighs equal to the molecular mass and contains avogadro's number (6.023\times 10^{23}) of particles.

To calculate the moles:

\text{Moles of potassium chloride}=\frac{\text{Mass of potassium chloride}}{\text{Molar mass of potassium chloride}}=\frac{33g}{74.5g/mole}=0.44moles

\text{Moles of potassium chlorate}=\frac{\text{Mass of potassium chlorate}}{\text{Molar mass of potassium chlorate}}=\frac{66g}{122.5g/mole}=0.54moles

According to stochiometry:

2 moles of KClO_3 produce = 2 moles of KCl

0.54 moles of KClO_3 should produce = \frac{2}{2}\times 0.54=0.54moles of KCl

Thus theoretical yield is moles\times {\text {Molar mass}}=0.54mol\times 74.5g/mol=40g

But Experimental yield is 33 g.

{\text {percentage yield}}=\frac{\text {Experimental yield}}{\text {Theoretical yield}}\times 100\%

{\text {percentage yield}}=\frac{33g}{40g}\times 100\%=82\%

The theoretical yield and percent yield for this experiment are 40 g and 82% respectively.

3 0
1 year ago
How many moles are in 425.0 g of sodium chloride?
Airida [17]

About 7.272 moles. Hope this helps!

5 0
2 years ago
Which is an example of practical pursuit of alchemy
Oduvanchick [21]
A practical pursuit of alchemy was the development of metallurgy practices. As alchemists always tried to turn various metals into other things, metalworking techniques were developed even though their experiments were often unsuccessful.
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8 0
2 years ago
Read 2 more answers
In a test tube you add 2 mL of saturated chlorine water followed by about 1 mL of an organic solvent such as heptane (or cyclohe
bazaltina [42]

Answer:

The organic compounds (heptane/cyclohexane) will get dissolve in Cl₂ water forming a yellow colored solution.

When NaI is added into it, the following reaction between NaI and Cl2 takes place;

Cl₂ + NaI ⇒ I₂ + NaCl

In above reaction, oxidation state of Cl is getting reduced from 0 in Cl2 to -1 in NaCl.

Therefore, Cl2 is getting reduced and acting as an oxidizing agent in the reaction. While I⁻ is getting oxidised annd acting as a reducing agent

7 0
2 years ago
Relate text and visuals using the cartoon, explain why the potassium atom becomes positively charged and the fluorine atom becom
tangare [24]
Elements are ionized because they aspire to be stable. The most stable form are the ones with full octet of electrons, the noble gases which consist of the last column in the periodic table. The rest of the elements either accept or readily donate electrons to conform to the electronic configuration that is the same with the nearest noble gas.

1. Potassium's nearest noble gas is Ar which is one electron fewer. So, when ionized, it donates 1 electron. Hence, K⁺.
2. The nearest noble gas for fluorine is Neon which is 1 electron more. Hence, it has to accept one more electron. Hence, F⁻.
5 0
2 years ago
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