Dynamic equilibrium only occurs in reversible reactions, and it’s when the rate of the forward reaction is equal to the rate of the reverse reaction.
CH4 + 2O2 -> 2H2O + CO2
You need to add a 2 in front of the O2 and H2O in order to balance the equation.
The combustion of a substance forming or breaking bonds mixing two substances.
A barometer is the answer
I believe the answer is .87g/mL. But I'm not sure so whatevs