Hi, could you please verify that my work is correct? Specifically #14 and #15 are the ones I'd like some clarification on. Have I missed anything? Are the sig figs correct?

When magnetite (Fe3O4) reacts with sodium chloride and molecular/elemental chlorine, the products are iron(III) chloride, sodium oxide and molecular oxygen. Write the balanced chemical equation for this reaction. 2(Fe3O4)+4(NaCl)+7(Cl2)C6(FeCl3)+2(Na2O)+3(O2)DPH14247623 - Calculate the number of grams of magnetite needed to produce 38.00g of iron(III) chloride. 2(Fe3O4)+4(NaCl)+7(Cl2)6(FeCl3)+2(N 53) 3=162.20~203(55.845)+4(15.999)=38.00g When carbon dioxide reacts with iron(III) hydroxide, the products are iron(III) carbonate and water. What mass (grams) of iron(III) carbonate is produced from 107 grams of 3+2= iron(III) hydroxide if the percent yield is 82.1%