Question

If the stoichiometric ratio of your reaction were 1:1, what volumes of hypochlorite and your unknown would you use to get the higest temperature possible? What if it was 1:3? 1:4? (Hint: Remember the total volume will be 10 mL)

Answer 1

Answer:

If it was 1:3, the unknown will be 7.5ml and if it was 1:4, the unknown will be 8ml. The explanation is shown below:

Explanation:

Stoichiometric ratio of hypochlorite and unknown

Ratio 1:1 in 10ml

Hypochlorite = $\frac{1}{2}$ mole fraction = 0.5

                      = 0.5ml x 10ml  = 5ml

Unknown   =  5ml  (i.e.  10ml [total volume given] - the answer of the hypochlorite)

Ratio 1:3

Hypochorite       =  $\frac{1}{4}$ mole fraction x 10ml

                           = 0.25 x 10ml  = 2.5ml

Unknown  =  10ml - 2.5ml   =  7.5ml

Ratio 1:4

Hypochlorite   =  $\frac{1}{5}$ mole fraction x 10ml

                        = 0.2 x 10ml   =   2ml

Unknown   =  10ml - 2ml = 8ml.