When gas is burned, how does the mass of the reactants (B4 burnin) compare to the mass of the products (AfterB

Question

When gasoline is burned, how does the mass of the reactants (B4 burnin) compare to the mass of the products (AfterBurning)?????

Answer 1

Carrying over from the previous answer, not necessarily. Since energy can neither be created not destroyed, none is "produced" in the reaction. Chemical bond energy is converted to sound, light, heat, and mechanical energy.

In any chemical reaction, energy must be supplied to start the reaction. Therefore, the total amount of energy to make the reaction happen will ALWAYS be greater than that obtained.

Entropy, S, is a measure of chaos. High values for entropy, S, match high amounts of disorder. Net entropy, "delta S", is ALWAYS > 0.

A physical law called the third law of thermodynamics says the entropy of the universe is increasing. This means that the entropy of the universe increases for every change that occurs.

As a substance is oxidized, it gives off energy in the breaking of chemical bonds, but it also consumes energy as new bonds are formed.

For all practical purposes, the masses of the products and reactants are identical. The actual differences would be measured in nano- or pico- grams, and this is well beyond the range of all but the most sophisticated instruments.

Answer 2

Burning gasoline is a chemical reaction of the carbon in the gasoline plus the oxygen needed to burn that gasoline. In a chemical reaction, all mass is conserved. This is a fundamental law of thermodynamics. So the mass of the reactants will equal the mass of the products.

The answer that stated that some mass was lost due to the energy released is wrong. Mass cannot be converted to energy in a chemical reaction...this only occurs in a nuclear reaction.

The burning of gasoline and oxygen is purely chemical. So the mass of the reactants will equal the mass of the products.

Answer 3

The mass of the products afterwards (everything included) is almost exactly the same as the mass that went in, minus a TINY ammount for the actual energy that was produced.
remember E=Mc2