CHE 103
Practice in empirical formulas and wt % composition
1. Calculate the wt % composition of the elements in these compounds: Fe2S3 K3[Fe(C2O4)3]
2. A compound is found by experiment to contain: 42.3 % Ba; 29.1 % Zr; 29.2 % S by weight. [Notice that t
CHE103
Practice Exercises: amountmass conversions
1. Calculate the molar mass of: K2HPO4 (NH4)2Fe(SO4)2 Fe3O4 calcium acetate
2. Calculate the mass of: 2.50 mol NaCl 0.037 mol H2SO4 14.5 mol Ag
3. Calculate the amount (in moles) in: 907 g C12H22O11 0.140
Exercise in chemical reaction stoichiometry CHE103 Iron (II) sulfate reacts with sodium hydroxide and sodium nitrate according to the reaction equation: 12 FeSO47H2O + 23 NaOH + NaNO3 4 Fe3O4 + NH3 + 12 Na2SO4 + 94 H2O Question 1: If 2.50 g FeSO47H2O reac
CHE103 Exercise in atomic weights and isotopes
Calculate the atomic mass of magnesium from the following isotope data: Isotope 24 Mg 25 Mg 26 Mg Mass 23.9850 u 24.9858 u 25.9816 u Fractional abundance 0.7899 0.1000 0.1101
Answer: at wt Mg = 24.305 u
Calcu