What information is needed to calculate the percent composition of a compound
2 answers:
Answer:
Molecular formula, molecular mass and the mass of each element in the molecule.
Explanation:
Percent Composition by Mass is the percentile of each element present in a molecule.
It is calculated by dividing the molar mass of a element by the molecule molar mass, multiplied by 100
Eg the mass percent compositionof carbon in carbon dioxide is 27.27%
Molecular formula: CO2
Molecular Mass: 44g/mol
C molar mass: 12g/mol
O molar mass: 16g/mol
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Answer : The reagent present in excess and remains unreacted is,
Solution : Given,
Moles of = 3.00 mole
Moles of = 2.00 mole
Excess reagent : It is defined as the reactants not completely used up in the reaction.
Limiting reagent : It is defined as the reactants completely used up in the reaction.
Now we have to calculate the limiting and excess reagent.
The balanced chemical reaction is,
From the balanced reaction we conclude that
As, 2 moles of react with 1 mole of
So, 3.00 moles of react with
moles of
From this we conclude that, is an excess reagent because the given moles are greater than the required moles and
is a limiting reagent and it limits the formation of product.
Hence, the reagent present in excess and remains unreacted is,