Gas Stoichiometry

Due Today: Ideal Gas Law worksheet
Due Tomorrow: Ideal vs. Combined worksheet
                                       Gas Stoich #1 worksheet

Today we learned how to do gas stoichiometry. Basically, we use stoichiometry to solve the equations of the different gas laws.

Today's demo was all about pressure of gas in a cannon.

                                                                                                                      

 After the demo, we had to answer a couple questions about it that would lead to gas stoichiometry:

 CaC₂ + 2H₂O --> C₂H_2(g) + Ca(OH) ₂

1.) How many moles of gas are formed in the cannon?

     To solve this problem, we use gram-->mol stoich:

 

     0.41g x 1mol CaC₂ x 1mol C₂H_{2  = 0.0064mol}

                        64 g         1 mol CaC₂

 

2.) What is the pressure of the gas that was formed in the cannon?

      To solve this problem, we first found all the variables of the ideal gas equation: PV=nRT. We used this equation because there is only one set of conditions.

 

       T = room temperature = 23°C = 296K

       n = 0.0064

       V = pr² h = p(2.68)² (41) = 870 cm³ = 870mL = 0.87L

       R = 0.00821 (atm/mol K)

The equation to solve for P is:

       (P)(0.87) = (0.0064)(0.00821)(296)

                    P = 0.18atm

 

This example should help with the Gas Stoich homework sheet. The other sheet for homework is review for the quiz tomorrow :)

 

 

 

 

 

 

 

 

 

 

Next Scribe: Eunice C.