A compound has to be chemically bonded, however, air is not chemically bonded.
This can be proven by freezing air. By freezing air, it yields different liquids at different temperature. Liquid nitrogen has a different boiling point than liquid oxygen.
If air was a compound, they would all have a single boiling point and a single freezing point.
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Methane is lighter than air, having a specific gravity of 0.554. It is only slightly soluble in water. It burns readily in air, forming carbon dioxide
and water vapour; the flame is pale, slightly luminous, and very hot.
The boiling point of methane is −162 °C (−259.6 °F) and the melting
point is −182.5 °C (−296.5 °F). Methane in general is very stable, but
mixtures of methane and air, with the methane content between 5 and 14
percent by volume, are explosive. Explosions of such mixtures have been
frequent in coal mines and collieries and have been the cause of many
mine disasters.
Answer:
Oxygen 16 is the most common naturally occurring isotopes of oxygen.
0.019moles
Explanation:
Given parameters:
Mass of Fe₂O₃ = 1.5g
Unknown:
Number of moles of Fe produced = ?
Solution:
To solve this problem, we must work from the known to the unknown. The known specie here is the mass of Fe₂O₃.
First inspect the equation and balance it;
2Fe₂O₃ + 3C → 4Fe + 3CO₂
Now find the number of moles of Fe₂O₃
Number of moles of Fe₂O₃ = 
molar mass of Fe₂O₃ = 2(56) + 3(16) = 112 + 48 = 160g/mol
Number of moles = 
= 0.009375moles
From the equation, we see that;
2 moles of Fe₂O₃ produced 4 moles of Fe
0.009375 moles of Fe₂O₃ will produce 
= 0.01875moles of Fe
To 2 decimal places;
0.019moles
learn more:
Number of moles brainly.com/question/1841136
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