Please help me with question A and B pleas

219 grams of iron (iii) oxide reacts with excess carbon according to the reaction equation shown below. fe2o3 + c → fe + co2 after a scientist performs the chemical reaction they find the actual yield of iron to be 57.4 grams. calculate the percent yield of this chemical reaction.

If 1.8 l of water is added to 2.5l of a 7.0 m koh solution, what is the molarity of the new solution

The variability in marine salinity between habitats does not impact the fish living there. select the best answer from the choices provided t f