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NemiM [27]
3 years ago
11

What is the main source of energy in stars?

Chemistry
2 answers:
enot [183]3 years ago
4 0

Answer:

nuclear fusion

Andrews [41]3 years ago
3 0

Answer:

<h3>Nuclear fusion. The particular type of fusion depends on the temperature, which is dictated by the mass and age of the star in question. For stars on the main sequence, the primary source is fusion hydrogen into helium via what is called the p-p (proton-proton) chain. For higher mass stars, they fuse hydrogen into helium primarily via the CNO (carbon-nitrogen-oxygen) cycle. As stars age off the main sequence, they can burn additional elements (such as helium, oxygen, silicone, etc), but these stages are much shorter.</h3>

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Calculate the number of water (H2O) molecules produced from the decomposition of 75.50 grams of Iron (III) hydroxide (Fe(OH)3).
Phantasy [73]

Answer: 6.38\times 10^{23} molecules of water are produced.

Explanation:

To calculate the moles :

\text{Moles of solute}=\frac{\text{given mass}}{\text{Molar Mass}}    

\text{Moles of} Fe(OH)_3=\frac{75.50g}{106.8g/mol}=0.707moles

The balanced chemical reaction is:

2Fe(OH)_3\rightarrow Fe_2O_3+3H_2O  

According to stoichiometry :

2 moles of Fe_2O_3 produce = 3 moles of H_2O

Thus 0.707 moles of Fe_2O_3 will produce=\frac{3}{2}\times 0.707=1.06moles  of H_2O  

According to avogadro's law, 1 mole of every substance contains avogadro's number 6.023\times 10^{23} of particles.

Thus 1.06 moles of H_2O contains = \frac{6.023\times 10^{23}}{1}\times 1.06=6.38\times 10^{23} molecules

5 0
3 years ago
IDENTIFY THE NUMBER OF SIGNIFICANT FIGURES IN EACH OF THESE MEASUREMENTS OF AN OBJECT: 76.47 AND 76.59
murzikaleks [220]

Answer:

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Explanation:

8 0
3 years ago
Explain light and waves and the properties of both.
yKpoI14uk [10]

Answer:

Electromagnetic waves are typically described by any of the following three physical properties: frequency (f), wavelength (λ), or intensity (I). Light quanta are typically described by frequency (f), wavelength (λ), or photon energy (E).

Explanation:

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3 years ago
What characteristic do all living things share?
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All organisms share certain characteristics of life, for example, all living things are made of cells and they must reproduce to make the next generation. Without these characteristics, there is no life.

I hope i helped??

8 0
3 years ago
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What happens where Earth's plates meet?
anzhelika [568]

Answer:

an earthquake

Explanation:

the tectonic plates rub together sending shockwaves

4 0
3 years ago
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