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maks197457 [2]
3 years ago
7

Which phrase is the best definition of matter?

Chemistry
2 answers:
Lubov Fominskaja [6]3 years ago
6 0
It would be B, hope this helps
Verdich [7]3 years ago
4 0

The amount of physical material in an object

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if you can’t already tell by the amount of questions i do not understand chemistry lol, giving brainliest
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Answer:

Ok, so the process here is to convert the mass of H2 (hydrogen gas) to moles by dividing the mass by the molar mass of H2. Once you have the moles then you have to multiply by the STP (standard temperature and pressure) molar volume which should be 22.4.

Molar mass of H2 = (1.01)x2 = 2.02g/mol

19.3/2.02 = 9.55 moles

Now just multiply the moles by the molar volume

9.55 moles x 22.4 = 213.92 Litres of H2 are in 19.3g of H2

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one molecule of chlorophyll contains 137 atoms. how many of these atoms come from the metal magnesium?
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</span>
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