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Nostrana [21]
3 years ago
7

NEED HELP ASAP !

Chemistry
2 answers:
aleksley [76]3 years ago
7 0

Answer:

A. Elements are pure substances.

Explanation:

Out of all four answers A would be best. Hope this helps.

Rom4ik [11]3 years ago
4 0

Answer:

B

Explanation:

I think all options can define element in one form or another but an element is characterized by the atomic number it has i.e you will know it's Carbon due to it's number of protons, neutrons and/or electrons.

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You have an unknown quantity of oxygen at a pressure of 2.2 atam, a volume of 21 liters and a temperature of 87 Celsius. How man
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<span>Let's assume that the oxygen gas has ideal gas behavior. 
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<span>
Hence, 1.56 moles of the oxygen gas are </span><span>left for you to breath.</span><span>
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