. The molar mass in grams is numerically equal to atomic/molecular/ formula mass in u. Molar mass of water = 18.02 g Molar mass of sodium chloride = 58.5 g 1.9 PERCENTAGE COMPOSITION So far, we were dealing with the number of entities present in a given C) N2O5. Which compound has the highest percent composition by mass of strontium? C) Substance A is an element and substance Z is a compound, An ion that consists of 7 protons, 6 neutrons, and 10 electrons has a net charge of, Pure silicon is chemically classified as a metalloid because silicon, C) exhibits metallic and nonmetallic properties. Report: Turn in observations, and a list of which components were present in your mixture. What is the empirical formula of the compound? A solid substance was tested in the laboratory. Plants acclimatize to rising CO 2 concentration and the fertilization effect diminishes over time. What is the empirical formula for a compound with the molecular formula C6H12Cl2O2? A) the motion of the gas particles is random and straight-line. The chemical bonds in this substance are most likely, D) metallic, because the valence electrons are mobile. A) 53% B) 20% ... A compound consists of 25.9% nitrogen and 74.1% oxygen by mass. Radioisotopes used for medical diagnosis must have, C) short half-lives and be quickly eliminated by the body. The plant height w as Separation Process Principles- Chemical and Biochemical Operations, 3rd Edition Which sample of CO2 has a definite shape and a definite volume? Which formula represents a polar molecule? K. What is the new pressure of the sample? C) Propanone has a higher vapor pressure and weaker intermolecular forces than water. Which atom in the ground state requires the least amount of energy to remove its valence electron? Which type of substance can conduct electricity in the liquid phase but not in the solid phase? According to the kinetic theory of gases, which assumption is correct? Which set of values represents standard pressure and standard temperature? An ionic compound is formed when there is a reaction between the elements, Two molecules of HBr collide and then form H2 and Br2. Each stoppered flask below contains 2 liters of a gas at STP. What is the total number of moles of atoms represented by the formula Al(C2H3O2)3? These liquids can be separated by distillation because the liquids have different. Greenland surface mass balance is projected at 1 km using dynamical and statistical downscaling. Which gas is least likely to obey the ideal gas laws at very high pressures and very low temperatures? Two basic properties of the gas phase are, D) no definite shape and no definite volume. The temperature of a 2.0 liter sample of helium gas at STP is increased to 27 C and the pressure is decreased to 80. kPa. All this is carried out in cup board.