In an atom of 118 50 X: (a) What is the atomic number? (b) How many neutrons are there? (c) How many protons are there? (d) How many electrons are there? (e) What is the mass number? (f) Give the symbol of the element X. 2. Give the names of the following ionic compounds: (a) NiSO3 (b) MnO (c) CoBr2 (d) Ag2CO3 (e) LiClO4 3. Give the formulas for the following ionic compounds: (a) copper(II) sulfate (b) cobalt(II) nitrate (c) potassium hydroxide (d) iron(II) chloride (e) silver(I) phosphate (f) sodium dihydrogen phosphate 4. Give the names of the following binary compounds between two nonmetals. (a) AsF5 (b) P4O7 (c) Br2O3 (d) HCl 5. For the element bismuth, Bi: (a) Calculate the number of moles in 7.33 g. (b) Calculate the number of grams in 0.220 mol. (c) How many moles are there in 7.06 x 10^22 atoms of the element? 6. Answer the following questions about the compound C5H10O3. Report your answers to parts (a)-(c) to 2 decimal places. (a) What is the molar mass (g/mol). (b) What is the percentage carbon? (c) What is the percentage hydrogen? (d) How many atoms of carbon are contained in 1.00 g of the compound? Report your answer in scientific notation to 3 significant figures. 7. A compound contains 38.70 % C, 9.74 % H, and 51.55 % O. (a) What is its empirical formula? (Report in the format CxHyXz). (b) If its molar mass is 62.1 g/mol, what is its molecular formula? 8. The element rhenium is used for catalysis of many organic reactions. The mass spectrum of the isotopes of rhenium is shown below. (a) How many protons are there in an atom of the most abundant isotope? (b) How many neutrons are there in an atom of the most abundant isotope? (c) How many electrons are there in an atom of the most abundant isotope? (d) If the mass of one isotope is 184.95295 amu and the mass of the other isotope is 186.95574 amu, calculate the atomic weight of rhenium and report it to the correct number of significant figures based on the data given. Mass spectrum of rhenium 37.40% 62.60% 185 186 187 Mass number