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Unit IV – Chapter 7 Section 7.3

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1 Unit IV – Chapter 7 Section 7.3
Gas Stoichiometry! Redding

2 Gas Stoichiometry The method of stoichiometry applies to all chemical reactions. This section extends to the stoichiometry of gases, using volume, pressure and temperature, molar volume and the ideal gas law

3 Remember the steps! Write the balanced chemical equation
Write down what you know and what you are trying to find out Convert the measured quantity to moles (chemical amount) using the appropriate equation Calculate the required chemical amount using a mole ratio Convert the chemical amount to the final quantity requested using the appropriate formula

4 Remember: STP = 22.4L/mol SATP = 24.8L/MOL
If 275grams of propane burns in a gas barbecue, what volume of oxygen measured at STP is required for the reaction? Remember: STP = 22.4L/mol SATP = 24.8L/MOL

5 Hydrogen gas is produced when sodium metal is added to water
Hydrogen gas is produced when sodium metal is added to water. What mass of sodium is necessary to produce 20.0L of hydrogen at SATP?

6 Last Example… I promise!
Ammonia, which is widely used as fertilizer, is produced from the reaction of nitrogen and hydrogen, What volume of ammonia at 450 kPa and 80 degrees can be obtained from the complete reaction of 7.5kg of hydrogen?

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