3. which is true about the combustion of carbon?
o carbon is produced from oxygen and carbon dioxide.
the reaction is spontaneous.
o enthalpy remains constant.
entropy decreases.

Entropy decreases

Explanation:

Entropy is the tendency of a system to proceed towards disorder. Combustion of carbon results in more order because the carbon combines with oxygen to form carbon monoxide or carbon dioxide. Therefore, the entropy decreases. When carbon is combusted, its enthalpy increases hence the reaction cannot be spontaneous.

the ideal gas law equation is as follows

pv = nrt

where p - pressure

v - volume

n - number of moles

r - universal gas constant

t - temperature

so if the pressure, volume and temperature are already known

we are left with n and r

since r is the universal gas constant that has a known fixed value then r too is known

so we are left with 'n'

once we know temperature volume and pressure

we can find the number of moles of gas present using the ideal gas law equation

this is not my own answer, this is an answer for the same question by the user blahblahmali. i do not claim ownership of this account.

може ли да зареждате повече информация, моля