AP MCQ 01ABCD PART 1 Question 01: What is the % by mass of beryllium chloride, BeCl2? 25.00% Be, 75.00% Cl 33.00% Be, 67.00% Cl 11.25% Be, 88.75% Cl 4.000% Be, 71.00% Cl Question 02: What is the mass, in g, of a single atom of sulfur? 5.32 x 10-23 g 6.02 x 1023 g 32.01 g 1.93 x 1025 g Questions 03-04: A compound is found to be 5.88 % hydrogen by mass, with the remainder of the compound being made up of oxygen. Question 03: What is the empirical formula of the compound? H2O2 H2O H6O94 HO Question 04: The compound has a molar mass of 34.02 g mol-1. What is its molecular formula? HO OH H2O2 H3O3 Question 05: How many barium ions does one mole of barium phosphate (Ba3(PO4)2) contain? 2 3 6.02 x 1023 1.81 x 1024 Question 06: What is the average atomic mass of a sample of naturally occuring X, if it is comprised of the following isotopes; 47% X51, 17% X52 and 36% X56? 50.98 52.97 55.97 56.10 Question 07: What do atoms of the isotopes Cl35, and Cl37, have in common, given that the average atomic mass is 35.45 amu? They have the same number of neutrons The have the same mass They have the same abundance (are present in a 50:50 ratio) They have the same number of protons Question 08: What is always true of a pure compounds' % by mass composition? It can be homogeneous or heterogeneous It is variable It can change from one sample to the next It is fixed Question 09: Which of the following types of substances must all pure substances fall into? Elements and mixtures Elements and compounds Compounds and mixtures Elements, mixtures and compounds Question 10: Which of the following statements is true regarding various oxides of nitrogen? NO is 50% N, and 50% O, by mass N2O4 has an empirical formula that is the same as the molecular formula, NO2 N2O5 and NO2 have the same empirical formula but different molecular formulae There is no relationship between the molecular and empirical formula of N2O4 Δ