Question

What is the average rate of production of water in the reaction below if the concentration of carbon dioxide is 2.5 mol/L after 2.0 minutes and 7.2 mol/L after 4.0 minutes? (Express answer in units of mol/L∙min) CH4(g) + 2O2(g) CO2(g) + 2H2O(g)

Answer 1

The reaction:

CH4(g) + 2O2(g) => CO2(g) + 2H2O(g) (written and balanced)

The formula used: rate of CO2

`rate\text{ CO2=}(\Delta\lbrack CO2\rbrack)/(\Delta time)=(7.2mol/L-2.5mol/L)/(4.0min-2.0min)=2.35mol/L.min`

From the reaction is shown the relation between CO2 and H2O produced:

2 H2O : 1 CO2

Therefore, the rate of production of H2O will be the twice of the CO2 rate:

rate H2O = 2 x 2.35 mol/L min = 4.7 mol/L min

Answer: 4.7 mol/L min