During chemical reaction 7.55gKI and 9.06g were allowed to react. How many grams of excess reagent are left over after the reaction is complete. Reaction: Pb(NO3)2(s) + 2KCI(s) > 2KNO3(s) + PbI(s)

7.45 g of excess reagent are left over after the reaction is complete.

Explanation:

To calculate the number of moles, we use the equation:

a)

b)

The balanced chemical reaction is :

According to stoichiometry :

2 moles of require = 1 mole of

Thus 0.045 moles of will require=  of

Thus is the limiting reagent as it limits the formation of product and is the excess reagent as (0.045-0.0225) = 0.0225 moles are left

Mass of

Thus 7.45 g of of excess reagent are left over after the reaction is complete.

a 20-cm-long, cylindrical graphite (pure carbon) rod is inserted into an oxidizing atmosphere at 1145 k and 1.013 x 105 pa pressure. the oxidizing process is limited by the diffu- sion of oxygen counterflow to the carbon monoxide that is formed on the cylindrical surface.

0.88m hope i am correct : )