Pbco3 and ki are used in this preparation. which one is the limiting reagent

Explanation

limiting reagent definition;  

is the reagent that is totally consumed when a chemical reaction occurs completely

write  a balanced  chemical equation for the reaction

that is

PbCO3 +2 Ki →  PbI2 + K2CO3

from the equation above the b 1 mole of PbCO3 react with 2 moles of Ki

therefore PbCO3 is the limiting reagent since has  less number of moles

answer is a

explanation:

answer : a model is often used to explain and make things easier to understand when any scientific topic needs to be demonstrated and explained.

as in this case where a scientist wants to use a model to present the results of his detailed scientific investigation. he should do it as it will him to make the audience understand the concept in a much better way. also, it can be changed according to new scientific understandings.