Look at the chemical equation. There is a number in the chemical equation that is not a subscript. What do you think the number 2 on the right side of the chemical equation represents? H2 + Cl2 → 2HCl

Number of moles or volume

Explanation:

The number 2 on the right hand side signifies the number of moles of the product being formed.

It is necessary to include this number so as not to flout the law of conservation of mass when writing a chemical equation. The law of conservation of mass states that "matter is neither created nor destroyed during the course of a chemical reaction".

Since we must have equal number of matter on both sides of the expression, the coefficient number like the 2 seen in the expression is used to create a balance.

Here, 2 moles of HCl is formed which consists of 1 hydrogen atom and 1 chlorine atom.

answer: 802.3 kilo joules of energy represents 191.75 kilo calorie of energy.

explanation:

energy released during combustion of one mole methane = 802.3 kilo joules

if 1 kilo joule = 0.239006   kilo calorie

then ,802.3 kilo joule will be = 802.30.239006 kilo calorie

802.3 kilo joule = 191.75 kilo calorie

hence, the energy in kilo calorie is 191.75 kilo calorie.

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