What conversion factor is always used in stoichiometry problems?

Answer 1

The mole to mole ratio for elements or compounds in the balanced equation is the conversion factor that is always used in stoichiometry problems. The molar mass, or g/mol, is another conversion factor that is frequently used in stoichiometry problems.

For example, the reaction between hydrogen and oxygen gas to form water can be represented by the balanced equation #"2H"_2("g") + "O"_2("g")##rarr##"2H"_2"O(g)"# .

The mole to mole ratio for oxygen and water is #(1 "mol O"_2)/(2 "mol H"_2"O")# or #(2 "mol H"_2"O")/(1 "mol O"_2)# .

If you are given the mass of one or more reactants or products, you can use its molar mass to convert its mass to moles. The molar mass can be used as a conversion factor as #("grams")/(1 "mol")# or #(1 "mol")/("grams")# .

For instance, you can convert 8.35 g of mass into moles using the molar mass of 15.999 g/mol for oxygen.

#8.35 cancel("g O"_2)xx(1 "mol O"_2)/(15.999 cancel("g O"_2))=0.522 "mol O"_2#

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Answer 2

Naomi Aronson

The conversion factor always used in stoichiometry problems is the mole ratio obtained from the balanced chemical equation.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.