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Empirical Formula quiz #3

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  • What is the empirical formula of acetic acid, HC2H3O2?
    The empirical formula is CH2O.
  • Write the empirical formula of copper chloride based on the experimental data.
    The empirical formula is CuCl2.
  • How is the empirical formula determined from the molecular formula?
    The empirical formula is found by dividing the subscripts in the molecular formula by their greatest common factor to get the simplest whole number ratio.
  • What does the empirical formula represent in a compound?
    It represents the simplest whole number ratio of the elements present in the compound.
  • When are the empirical and molecular formulas of a compound identical?
    They are identical when the subscripts in the molecular formula cannot be reduced by any common factor.
  • What is the role of mass percentage in determining the empirical formula?
    Mass percentage helps calculate the relative number of moles of each element, which is then used to find the simplest ratio for the empirical formula.
  • Why must the empirical formula contain whole numbers for each atom?
    Because chemical formulas represent actual atoms, and atoms cannot be split into fractions in a formula.
  • What is the relationship between the mole concept and empirical formulas?
    The mole concept allows conversion between mass and moles, which is necessary to determine the simplest ratio of atoms for the empirical formula.
  • If a compound has a molecular formula of C10H14N2, what is its empirical formula?
    Its empirical formula is C5H7N, obtained by dividing each subscript by 2.
  • What does the molecular formula tell you that the empirical formula does not?
    The molecular formula gives the exact number of each type of atom in a molecule, while the empirical formula only shows the simplest ratio.
  • What is the difference between an empirical formula and a molecular formula in chemistry?
    The empirical formula shows the simplest whole number ratio of elements in a compound, while the molecular formula indicates the exact number of atoms of each element present in a molecule.
  • When is a molecular formula also an empirical formula?
    A molecular formula is also an empirical formula when the numbers of atoms of each element cannot be reduced further; that is, when the ratio is already in the simplest whole number form.
  • For which type of compounds is SO3 an empirical formula?
    SO3 is an empirical formula for compounds where the ratio of sulfur to oxygen atoms is 1:3 and cannot be simplified further.
  • How do you determine the empirical formula of C6H18O3?
    Divide each subscript by the greatest common factor, which is 3, resulting in the empirical formula C2H6O.
  • What is the empirical formula for C2H6?
    The empirical formula for C2H6 is CH3.
  • How do you find the empirical formula for C3H6?
    Divide each subscript by the greatest common factor, which is 3, resulting in the empirical formula CH2.
  • What is the empirical formula for N2O4?
    The empirical formula for N2O4 is NO2.
  • How can you identify pairs of compounds that share the same empirical formula?
    Compounds share the same empirical formula if their molecular formulas reduce to the same simplest whole number ratio of elements.
  • What is the empirical formula for a compound with the formula A3B9?
    Divide each subscript by the greatest common factor, which is 3, resulting in the empirical formula AB3.
  • How can you determine if a given formula is an empirical formula?
    A formula is an empirical formula if the subscripts of all elements are in the simplest whole number ratio and cannot be reduced further.
  • How do you identify compounds with the same empirical formula?
    Compounds have the same empirical formula if their molecular formulas can be reduced to the same simplest whole number ratio of elements.
  • What is the empirical formula for a pentose sugar?
    The empirical formula for a pentose sugar is CH2O.
  • What is the empirical formula for Hg2(NO3)2?
    The empirical formula for Hg2(NO3)2 is Hg(NO3).
  • What steps are involved in determining the empirical formula from a molecular formula?
    Divide the subscripts of each element in the molecular formula by their greatest common factor to obtain the simplest whole number ratio.