Question

BRAINLIEST IF ANSWERED CORRECTLY WITH EXPLANATION! HELP PLEASE:)

Answer 1

First question

$Pb(NO_3)_2 + KI \rightarrow PbI_2 + KNO_3$

Balaneced:

$Pb(NO_3)_2 + 2KI \rightarrow PbI_2 + 2KNO_3$

Find how many moles potassium iodide it is in 345.0 grams

$n_{KI} = \frac{345.0 \ g}{166.0 \ g/mol} = 2.078 \ mole$

Find how many moles potassium nitrate there is for 2.078 moles $KI$

$n_{KNO_3} = \frac{2}{2} \cdot n_{KI} = 2.078 \ mole$

Find how many grams potassium nitrate there is in 2.078 moles $KNO_3$

$m_{KNO_3} = 2.078 \ mol \cdot 101.1 \ g/mol = 210.1 \ g$

Second question

$yield \ \% = \frac{experimental}{theoretical} \cdot 100 = \frac{195.3 \ grams}{210.1 \ grams} \cdot 100 = 93.0 \ \%$