Gas stoichiometry is the study of the relative amounts of reactants and products in gaseous chemical reactions.

 

But FIRST,  what is stoichiometry..

 

STOICHIOMETRY the study and calculation of quantitative (measurable) relationships of the reactants and products in chemical reactions (chemical equations)

Skills need to develop in solving stoichiometry problems:

Apply gas laws to solve stoichiometry problems.

Apply principles of stoichiometry to calculate properties of gases.

PROBLEM 1

Given the balanced equation

 

            3Cu(s)  +  8HNO3(aq) →  3Cu(NO3)2(aq)  +  2NO(g)  +  4H2O(l)

 

determine the mass of copper that would be required to produce 4.00 L of nitrogen  monoxide at 102.5 kPa and 22 degree Celsius.

 

Solutions:

Determine the number of moles of NO(g)

Rearrange the ideal gas law equation

 

                                PV=nRT        =         n=  PV/RT 

 

n = 102.5 kPa x 4.00 L / 8.314 kPa L mol−1K−1x 295 K, n=0.167 mol NO

 

From the balanced equation we see that

                                3 moles Cu → 2 moles NO produced

 

Determine the number of moles of Cu

 

 

 

 

 

 

 

 

 

 

ACTIVITY

Hydrogen sulfide reacts with sulfur dioxide to give H2O and S,

      H2S + SO2 = H2O + S(solid), unbalanced.

      If 6.0 L of H2S gas at 750 torr produced 3.2 g of sulfur, calculate the temperature in C.

 Answer: 812°C

2.     What volume (L) will 0.20 mol HI occupy at 300 K and 100.0 kPa? R = 8.314 kPa L / (K mol) = 0.08205 atm L / (mol              K).

 Answer: 5 L

 

REFERENCE:

http://www.science.uwaterloo.ca/~cchieh/cact/c120/gastoichiometry.html

http://www.clickandlearn.org/chemistry/gas_laws.htm

https://www.boundless.com/chemistry/gases/gas-stoichiometry/gas-stoichiometry/

 

written by: Terry Maine Dela Pieza