Mass to Mass Conversions

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Presentation transcript:

Mass to Mass Conversions 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 mole ratio to convert known to unknown Converting the unknown to mass

Combustion Example 1CH4 + 2O2 → 2H20 + 1CO2 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

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.

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.

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.

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