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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.