Question

let us take an example of equation H2+O2--->H2O how do we know that H has 2 molecules how can we determine that.
other example C6H1206+6CO2--->6CO2+6H2O+ energy
how can we determine how many molecules it consists and we have to write the number there.
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Answer 1

Answer:

i can't able to understand the question

Answer 2

Explanation:

Reading Chemical Equations: In the following equation for photosynthesis : 6CO2+12 H2O + Light → C6H12O6 +6 O2 +6H2O Numbers and letters written together are molecules (6CO2). ... For CO2 there is one atom of carbon and two atoms of oxygen. For H2O, there is one atom of oxygen and two atoms of hydrogen.