10. Calculate the molecular mass of menthol, C10H20O.A) 156 amu B) 140 amu C) 29 amu D) 146 amu11. The molecular formula of aspirin is C9H8O4. How many aspirin molecules are present in one 500-milligram tablet?A) 2.77 moleculesB) 2.77 10–3 moleculesC) 1.67 1024 moleculesD) 1.67 1021 moleculesE) None of these is correct.12. How many sodium atoms are there in 6.0 g of Na3N?A) 3.6 1024 atomsB) 4.6 1022 atomsC) 1.3 1023 atomsD) 0.217 atomsE) 0.072 atoms13. How many grams of sulfur are there in 6.0 g of Fe2(SO4)3?A) 2.40 g B) 0.48 g C) 6.00 g D) 0.92 g E) 1.44 g14. A mass spectrometer works by ionizing atoms or molecules, and then accelerating them pastoppositely charged plates. The mass is obtained byA) measuring the force of impact on a detecting screen, and then calculating the massusing force = mass acceleration.B) suspending the ions in an applied electric field, and then calculating mass by settingthe downward gravitational force equal to the upward electrostatic force.C) measuring the magnitude of deflection as the ions pass through a magnetic field toobtain the charge-to-mass ratio, and then calculating the mass from that ratio.D) measuring the time it takes for the ions to hit the detector at a known distance tocalculate the acceleration, and then calculating mass from force = mass acceleration.15. The empirical formula of a compound of uranium and fluorine that is composed of 67.6% uranium and 32.4% fluorine isA) U2F. B) U3F4. C) UF4. D) UF6. E) UF8.16. An organic thiol compound is 38.66% C, 9.73% H, and 51.61% S by mass. What is the empirical formula of this compound?A) C2H6S B) C3H8S C) C4H10S D) C4H12S E) C5H14S17. Which one of the following chemical reactions is balanced?A) HCl + KMnO4 Cl2 + MnO2 + H2O + KClB) HCl + KMnO4 Cl2 + MnO2 + 2H2O + KClC) 2HCl + 2KMnO4 Cl2 + MnO2 + 2H2O + 2KClD) 6HCl + 2KMnO4 2Cl2 + 2MnO2 + 4H2O + 2KClE) 8HCl + 2KMnO4 3Cl2 + 2MnO2 + 4H2O + 2KCl18. What is the coefficient of H2O when the following equation is properly balanced with smallest set of whole numbers?___ Al4C3 + ___ H2O ___ Al(OH)3 + ___ CH4 A) 3 B) 4 C) 6 D) 12 E) 2419. When a chemical equation is balanced, it will have a set of whole number coefficients that cannot be reduced to smaller whole numbers. What is the coefficient for O2 when the following combustion reaction of a hydrocarbon is balanced?___ C7H14 + ___ O2 ___ CO2 + ___ H2OA) 42 B) 21 C) 11 D) 10 E) none of these20. Balance the equation below using the smallest set of whole numbers.of H2O?___ PCl3(l) + ___ H2O(l) ___ H3PO3(aq) + ___ HCl(aq)What is the coefficientA) 1 B) 2 C) 3D) 5 E) none of these21. Balance the following equation using the smallest set of whole numbers, then add together thecoefficients. Do not forget to count coefficients of one. The sum of the coefficients is ___ CH4 + ___ Cl2 ___ CCl4 + ___ HClA) 4. B) 6. C) 8. D) 10. E) 12.22. Ammonia reacts with diatomic oxygen to form nitric oxide and water vapor:4NH3 + 5O2 4NO + 6H2OWhen 20.0 g NH3 and 50.0 g O2 are allowed to react, which is the limiting reagent? A) NH3 B) O2 C) NO D) H2O E) No reagent is limiting.23. How many grams of Cl2 can be prepared from the reaction of 16.0 g of MnO2 and 30.0 g of HCl according to the following chemical equation?MnO2 + 4HCl MnCl2 + Cl2 + 2H2OA) 0.82 g B) 5.8 g C) 13.0 g D) 14.6 g E) 58.4 g