Answer:
80cm3 of water, and 60cm3 carbon IV oxide is formed while 20cm3 of oxygen is left unreacted.
Explanation:
From Gay-Lussac's law, there are five volumes of oxygen, 1 volume if propane, 4 volumes of water and three volumes of CO2. Applying this shows the reacting volumes as we have in the image attached, hence the volumes left after reaction.
It describes how, when particles/mc/elements react, despite forming different substances the mass is neither created nor destroyed but only converted.
it's the third one The chemical equation will have two arrows pointing in different directions. !
They would most likely speed up.