Use the periodic table to answer the following questions. (Round atomic masses to the nearest tenth unit.) \text { a. What is the molar mass of } \mathrm{Fe}\left(\mathrm{NO}_{3}\right)_{2} \text {

? (. } 5 \text { point) } \text { d. What is the molarity of } 48.6 \mathrm{~g} \text { of magnesium ( } \mathrm{Mg} \text { ) ions in } 2 \mathrm{~L} \mathrm{H}_{2} \mathrm{O} \text { ? (.5 point) } \text { What is the number of molecules of } 140 \mathrm{~g} \text { of } \mathrm{CO} \text { ? } What is the number of moles of 27.6 g of lithium (