The masses conservation law allows us to find that the answer for which the quantity of product is less than are:
One of the great conservation laws of science is the conservation of mass, therefore the initial mass is equal to the final mass, even in nuclear reactions where part of the mass is converted into energy, if it is taken into account mass and energy this mass-energy relationship is conserved.
In a chemical reaction the constituents mix and form new compounds, in an ideal case all the material of the constituents must react, but in real cases there is some part of the reactants that does not react in the required direction, therefore the amount of product is less than expected.
When adding the moles of the refractants and comparing with the moles of the product and the unreacted or reacted material in other products should be the same.
The fact that there is less product than expected in a reaction is due to the existence of other competitive reactions.
Consequently using the masses conservation law we can find that the quantity of products is less than expected are:
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