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spin [16.1K]
3 years ago
10

How is the number of moles of an element determined from a known mass?

Chemistry
1 answer:
goblinko [34]3 years ago
4 0

the mass of 1 mole of the element is used as a conversion factor to convert grams to moles

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We observe a distant object in space and see that the spectral lines for hydrogen in the object's light appear at a shorter wave
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Answer:

This tells us the radial velocity of the object and that the object is approaching or coming towards us.

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Certain chemicals radiate with particular wavelengths or colors  when their temperature is raised or when they are charged electrically. Also observable are dark strokes separating the spectrum known as absorption lines

These spectral lines of chemicals are well known as stated above and from the phenomenon of Doppler effect, spectroscopy can be used to detect the movement of a distant object by the change of the emitted frequency of the wavelength

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