Answer to Question #122775 in General Chemistry for israh

Question

INFO: When aqueous solutions of lead (II) nitrate and potassium iodide are mixed together,
a bright yellow precipitate is produced. This yellow powder was a common pigment
in paints until its use was discontinued for safety reasons.

TASK: Use stoichiometry to determine the mass of potassium iodide needed to
produce 50.00 g of the precipitate.

Answer 1

Pb(No3)2+2KI-PbI2+2No3

clearly from the equation we have that:

2molecules of KI yields 1 molecule of Pbl2.

so we have (50.0g×2)/1=100gms.