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How is stoichiometry used to calculate the mass of a substance?
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A. Unit conversion factors are used to convert between units of
grams and moles.
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B. Oxidation numbers are used to convert from moles of one
molecule to moles of another molecule.
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C. Subscripts in chemical formulas are used to calculate amounts of
substances.
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D. Percent contributions are used to convert between molar mass
and mass.
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Answer:

A. Unit conversion factors are used to convert between units of

grams and moles.

Explanation:

  • In stoichiometry mass of a substance is calculated from the inter-conversion between moles and grams using conversion factors.
  • That is, to calculate the mass of a compound or an element in a chemical equation we multiply the number of moles by the molar mass of the compound.
  • Moles can be calculated from the mole ratio of reactants and products involved or by dividing mass of a compound by the molar mass.

Answer:

A. Unit conversion factors are used to convert between units of

grams and moles.

Explanation:

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