chemical accountings

Chem 3070 Name: Ch. 5 Chemical Accountings Dr. N. Stessman 1. How many oxygen atoms does aluminum dihydrogen phosphate, Al(H2PO4)3 ? 2. Write a balanced chemical equation for the following process: a) Nitrogen gas and oxygen gas react to form dinitrogen tetroxide b) Uranium (VI) oxide reacts with hydrogen fluoride to form uranium (VI) fluoride and water c) Hexane (C6H14) burns in oxygen gas to form carbon dioxide and water. 3. Three balloons are filled with equal volumes of carbon dioxide, chlorine gas, and nitrogen gas, respectively. (a). which one contains the most molecules? (b). Which one has the greatest mass? 4. (a) How many molecules are there in 2.00 moles of Al2S3 ? (b). How many sulfide ions are there in 2.00 moles of A2S3 ? 5. Consider the reaction below to answer the following questions 4KO2+2CO22K2CO3+3O2 (a) Calculate the molar mass of KO2. (b) How many moles of KO2 in 5.00g of KO2 ? (c) How many moles of oxygen gas are produced when 2.81 moles of KO2 react? (d) How many moles of CO2 are consumed when 8.12 moles of oxygen gas are produced? (e) What is the mass of potassium carbonate (K2CO3) produced in grams from 5.55g of potassium oxide KO2 ? 6. Calculate the molarity of the following solution of 9.66 mole LiNO LO38.83L solution. 7. What mass in grams of solute is needed to prepare 2.25L of 0.500MHCl ? 8. What is the percent by volume concentration of 58.0mL of methanol in 755mL of a methanol-water solution? 9. Describe how you would prepare 3375g of an aqueous solution that is 8.2%NaCl by mass