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Mass to Mass Conversions

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Ch 9 Stoichiometry Mass to Mass Conversions Mass-Mass Conversions A mass to mass conversion is a three step process involving: Converting the known to moles Using the ... – PowerPoint PPT presentation

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Title: Mass to Mass Conversions


1
Mass to Mass Conversions
  • Ch 9 Stoichiometry

2
Mass-Mass Conversions
  • A mass to mass conversion is a three step process
    involving
  • Converting the known to moles
  • Using the mole ratio to convert known to unknown
  • Converting the unknown to mass

3
Combustion Example
  • 10.0 grams of methane combusts producing carbon
    dioxide gas and water vapor. How much oxygen is
    required to fully combust the grams of methane?
  • Write and balance the equation
  • 1CH4 2O2 ? 2H20 1CO2

4
Step 1 grams to moles
  • In converting from grams to moles you divide by
    the molar mass of the known.
  • Actually you multiply by the ratio of one mole to
    x number of grams.

5
Step 2 moles to moles
  • In converting from moles to moles you use a ratio
    from the balanced equation.
  • The unknown should be in the numerator and the
    known in the denominator.

6
Step 3 moles to grams
  • The final step is to convert the moles of unknown
    to grams.
  • To do this multiply the moles by the molar mass
    of the unknown.

7
Steps 1-3 together
  • The better method is to do all three steps in one
    calculation and one equation line.
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