Answer is: D: Two molecules of potassium chloride react with one molecule of lead nitrate to form two molecules of potassium nitrate and one molecule of lead chloride.
Balanced chemical reaction: 2KCl + Pb(NO₃)₂ → 2KNO₃ + PbCl₂.
According to principle of mass conservation, number of atoms must be equal on both side of balanced chemical reaction.
KCl - potassium chloride.
Pb(NO₃)₂ - lead nitrate.
KNO₃ - potassium nitrate.
PbCl₂ - lead chloride.
This is a stoichiometry question
The stoichiometry between FeCr2O7:CO2
=4:8
=1:2
therefore moles of FeCr2O7 needed=2 *20moles
=40 moles
