Question

In the following chemical reaction, how many moles of O2 are needed to produce 2.8 mol of CO2? C2H6 + O2 → CO2 + H2O?

How many moles of methane are produced when 36.6 moles of carbon dioxide gas react with excess hydrogen gas?

How many moles of hydrogen gas would be needed to react with excess carbon dioxide to produce 53.6 moles of water vapor?

Plants convert carbon dioxide and water to glucose (C6H12O6) and oxygen in the process of photosynthesis.

1.Write a balanced equation for this reaction.

2. Determine how many moles of CO2 are required to produce 42.0 mol of glucose.

How many grams of sulfur can be made in the following reaction if 17.0 grams of H2S reacted with excess SO2?

2 H2S + SO2 → 2 H2O + 3 S

Answer 1

1)

2 C2H6 + 7 O2 ----------------------> 4 CO2 + 6 H2O

   2 mol       7 mol                               4 mol     

                                                           2.8 mol

4 mol of CO2 produce from --------------- 7 mol of O2

2.8 mol of CO2                      ------------- x mol of O2

moles of O2 = x = 2.8 x 7 / 4

                   = 4.9 mol

moles of O2 = 4.9 moles

2)

CO2 + 4 H2   ---------------------> CH4   + 2 H2O

1 mol                                             1 mol

1 mol CO2 -----------   1 mol CH4

36.6 mol CO2 --------- 36.6 mol CH4

moles of methane = 36.6 moles

3)

CO2     +    H2 ----------------->   H2O + CO

       1 mol                         1 mol

                                                   53.6 mol

1 mol H2 gives --------------- 1 mol H2O

53.6 mol H2 --------------- 53.6 mol H2O

moles of H2 = 53.6

1)

balanced equation :

6 CO2 + 6 H2O   ----------------------> C6H12O6 + 6 O2

2) Determine how many moles of CO2 are required to produce 42.0 mol of glucose.

6 CO2 + 6 H2O   ----------------------> C6H12O6 + 6 O2

6 mol                                                     1 mol

x mol                                                       42 mol

moles of CO2 needed = 42 x 6 / 1

                                     = 252 mol

3) How many grams of sulfur can be made in the following reaction if 17.0 grams of H2S reacted with excess SO2?

2 H2S   +   SO2 ---------------->    2 H2O   +   3 S

68 g                                                                   96 g

17 g                                                                    24 g

grams of sulfur needed = 24 g