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.

i'm assuming that the correct answer is indeed the first one/ "a"..

since electrons are negative the answer is neagtaive