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Gnom [1K]
3 years ago
11

Why do we need a “mole”?

Chemistry
2 answers:
Triss [41]3 years ago
7 0
The mole is important because it allows chemists to work with the subatomic world with macro world units and amounts
Ivan3 years ago
4 0
Wdym mole like the animal or something else ?
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Which has more energy: yellow or violet light? And why?
Ilya [14]
This is funny, because last year I did a project on wave lengths, but despite that; Violet light has more energy than yellow light because on the light spectrum, violet has the least wavelengths. This means they carry the most energy.
8 0
3 years ago
What formula results when Ca+2 and Br -1 ions bond?
olga nikolaevna [1]
CaBr2
Because of the criss cross method of switching the charges
3 0
3 years ago
A 4.215 g sample of a compound containing only carbon, hydrogen, and oxygen is burned in an excess of oxygen gas, producing 9.58
Scilla [17]

Answer:

\% O=27.6\%

Explanation:

Hello,

In this case, for the sample of the given compound, we can compute the moles of each atom (carbon, hydrogen and oxygen) that is present in the sample as shown below:

- Moles of carbon are contained in the 9.582 grams of carbon dioxide:

n_C=9.582gCO_2*\frac{1molCO_2}{44gCO_2}*\frac{1molC}{1molCO_2}  =0.218molC

- Moles of hydrogen are contained in the 3.922 grams of water:

n_H=3.922gH_2O*\frac{1molH_2O}{18gH_2O} *\frac{2molH}{1molH_2O} =0.436molH

- Mass of oxygen is computed by subtracting both the mass of carbon and hydrogen in carbon dioxide and water respectively from the initial sample:

m_O=4.215g-0.218molC*\frac{12gC}{1molC} -0.436molH*\frac{1gH}{1molH} =1.163gO

Finally, we compute the percent by mass of oxygen:

\% O=\frac{1.163g}{4.215g}*100\% \\\\\% O=27.6\%

Regards.

5 0
4 years ago
How many moles of NH3 are necessary to produce 0.824 mol N2
kolezko [41]
Moles H2 required = 3 x 0.230=0.690 
<span>moles H2 in excess = 0.750 -0.690 =0.060 </span>

<span>the ratio between N2 and NH3 is 1 : 2 </span>
<span>moles NH3 = 0.230 x 2 = 0.460</span>
3 0
4 years ago
Read 2 more answers
Classify the following processes as exothermic or endothermic: (d) a person running;
Sonja [21]

The process releases energy and consequently we classify it as exothermic. (d) a person running releases warmness as muscle mass paintings. therefore, the procedure is exothermic.

d) Exothermic, heat is released as a person runs and muscle groups perform work.

A chemical response or bodily exchange is exothermic if warmth is released by using the system into the environment. Because the surroundings are gaining heat from the system, the temperature of the surroundings increases. The sign of q for an exothermic procedure is -ve due to the fact the device is dropping heat.

Some other examples of exothermic reactions:

1)Snow Formation in Clouds.

2)Burning of a Candle.

3)Rusting of Iron.

4)Formation of Ion Pairs.

5)response of strong Acid and Water. etc...

Learn more about exothermic reactions here: brainly.com/question/14018816

#SPJ4

6 0
2 years ago
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