HW Quiz A student placed a piece of tin in hydrochloric acid. Hydrogen gas was given off, then the liquid was evaporated off. The remaining solid, Sn.

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Presentation transcript:

HW Quiz A student placed a piece of tin in hydrochloric acid. Hydrogen gas was given off, then the liquid was evaporated off. The remaining solid, Sn x Cl y was massed. Use the data below to determine the empirical formula of tin chloride (Sn x Cl y ). Mass of beaker g Mass of tin and beaker before reaction g Mass of tin chloride and beaker after reaction g Determine the formula of Sn x Cl y

Agenda WB Worksheet 2.5 Empirical Practice Molecular Notes Homework: Empirical Formula Lab Quiz tomorrow! U5 w/s 3

Molecular Formulas Definition Example: Show the types and numbers of atoms in a compound. (H 2 O 2 ) Same as the empirical formula or a whole # multiple of it. C 6 H 12 O 6 = molecular formula of glucose. CH 2 O= empirical formula of glucose (or any sugar) H 2 O = empirical and molecular formula of water

Molecular Formulas Needed: Need (or need to be able to calculate): Empirical Formula (you may need to find this ) Formula Mass or Molar Mass of Molecular Compound (must be given)

Molecular Formulas Solve The empirical formula of a compound is P 2 O 5 and it has a formula mass of g. What is the molecular formula of the compound?

Molecular Formulas- Steps 1. Molar mass of the molecular compound g (from problem) 2. Empirical formula of the compound. P 2 O 5 (from problem) 3. Molar mass of the empirical formula. 2(Mass of P) + 5(Mass of O) = g 4. Molar mass of molecular formula (must be the one given)/ molar mass of empirical formula (always the same or smaller #) g / g = Multiply subscripts in empirical formula by answer above 2(P 2 O 5 ) = P 4 O 10

Remember! By definition, the molecular formula is the same as or a whole number multiple of the empirical formula… If your number did not come out perfect- CHECK YOUR MATH!

Solve the following: 4. A compound has 7.6g Nitrogen, 17.4g Oxygen, and a molar mass of 138g. What is the empirical formula? What is the molecular formula? Write the name of the compound!