How do you apply gas stoichiometry?

1 Answer

N_2 + 3H_2 ---> 2NH_3 What volume of hydrogen is necessary to react with five liters of nitrogen to produce ammonia? (Assume constant temperature and pressure.)

N_2 + 3H_2 ---> 2NH_3 , as per this equation, 1 volume of Nitrogen , needs 3 volumes of Hydrogen. The reaction produces two volumes of ammonia.

Let us write this as equation;

"1 volume of Nitrogen"/"3 volume of Hydrogen" (a)

If we start with 5 L of Nitrogen , X volumes of Hydrogen will be needed.

Let us write this as equation;

"5 L of Nitrogen"/"X L of Hydrogen" (b)

equate (a) and (b)
1/3 = 5/X

cross multiply 1 * X = 3 * 5 , X=15 L

2CO + O_2 ---> 2CO_2 How many liters of carbon dioxide are produced if 75 liters of carbon monoxide are burned in oxygen? How many liters of oxygen are necessary?

As per this equation, 2 volumes of Carbon Monoxide, needs 1 volume of Oxygen. The reaction produces two volumes of Carbon dioxide.

Let us write this as equation;

"2 volume of Carbon Monoxide"/"2 volumes of Carbon Dioxide" (a)

If we start with 75 L of Carbon monoxide , X volumes of carbon dioxide will be produced.

Let us write this as equation;

"75 L of CO"/("X L of "CO_2) (b)

equate (a) and (b)

2/2 = 75/X

cross multiply 2*X = 2*75 , X= 75 L

"2 volume of Carbon Monoxide"/"1 volumes of Oxygen" (a)

If we start with 75 L of Carbon Monoxide , X volumes of Oxygen will be needed.

"75 L of CO"/("X L of "O_2) (b)

equate (a) and (b)

2/1= 75/X

2*X = 75*1

2X =75

X= 37.5 L