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.

if the temperature drops and becomes cool

then the atmosphere can be freezing as the water vapor in the air is at maximum (100%) and can be severely cold

also can be snowing lightly as the moisture in the air will start to solidify

and btw this is not chemistry but