Mass Spectrometry and Percent Composition Test 1

Question 1 Using the mass spectrum below and the following data: 55.8 % C, 11.6% H and 32.6% N by mass Determine the molecular formula of the particles of the substance. Question 1 (Attempt 2) Using the mass spectrum below and the following data: 48.6 % C, 8.1% H and 43.2% O by mass Determine the molecular formula of the particles of the substance. Question 1 (Attempt 3) Using the mass spectrum below and the following data:47.4 % C, 10.5% H and 42.1% O by mass Determine the molecular formula of the particles of the substance. Question 2 Rank the mass of a sample of 5.4 x 10^21 particles of BrF3, SOCl2 and NCl3: Question 2 (Attempt 1) Rank the mass of a sample of 8.5 x 10^22 particles of B2O3, P2O5 and AsO2 Question 2 (Attempt 3) Rank the mass of a sample of 3.2 x 1022 particles of CBrF3, CHFCl2 and CF3Cl Question 3 Calculate the number of moles in 34.7 grams of C2H4O2 Question 4 Calculate the number of grams in 5.8 x1024 particles of C2H6O Question 5 Different substances have different boiling points because their particles Question 5 (Attempt 2) Different substances have different melting points because their particles Question 6 Select the correct analysis for the following process: Question 6 (Attempt 2) Select the correct analysis for the following process: Question 7 Use the mass spectrum shown below to estimate the molar mass of the analyzed substance: Question 7 (Attempt 2) Use the mass spectrum shown below to estimate the molar mass of the analyzed substance: Question 7 (Attempt 3) Use the mass spectrum shown below to estimate the molar mass of the analyzed substance: Question 8 An isotope of element X has 14 protons and 16 neutrons, select the correct representation of this isotope: Question 8 (Attempt 2) An isotope of element X has 15 protons and 16 neutrons, select the correct representation of this isotope: Question 9 Select the change(s) in pressure or temperature that could lead to the process represented in this image: Question 9 (Attempt 2) Select the change(s) in pressure or temperature that could lead to the process represented in this image: Question 10 Select the correct answer based on the phase diagram and ΔE vs Pressure (P) graph shown below corresponding to a process at constant temperature T = 200 K. Question 10 (Attempt 2) Select the correct answer based on the phase diagram and ΔE vs Pressure (P) graph shown below corresponding to a process at constant temperature T = 200 K. Question 11 The following PEC diagram represent the mixing of two substances. Which of the following statements is true about the two states involved? Question 11 (Attempt 2) The following PEC diagram represent the mixing of two substances. Which of the following statements is true about the two states involved? Question 12 Given the data provided, select the temperature range for which a mixture of the four substances would have to be represented as shown below: Question 12 (Attempt 2) Given the data provided, select the temperature range for which a mixture of the four substances would have to be represented as shown below: Question 12 (Attempt 3) Given the data provided, select the temperature range for which a mixture of the four substances would have to be represented as shown below: Question 13 Identify the empirical formula for the compound with the mass composition and mass spectrum shown below 40.7% C, 8.5% H, 23.7% N, and 27.1% O Question 13 (Attempt 2) Identify the empirical formula for the compound with the mass composition and mass spectrum shown below 32.9% C, 6.8% H, 38.3% N, and 21.9% O Question 14 How many elementary substances are represented in this mixture? Question 14 (Attempt 2) How many chemical compounds are represented in the gas phase of this mixture? Question 15 In the mixture of substances shown below, select the particles that are expected to have the lowest average speed at 273 K. Question 15 (Attempt 2) In the mixture of substances shown below, select the particles that are expected to have the highest average speed at 300 K. Question 15 (Attempt 3) In the mixture of substances shown below, select the particles that are expected to have the highest average speed at 300 K. Question 16 For the following two possible states of a substance, identify the conditions of pressure and temperature that would most favor the formation of state A (HINT: Build the PEC diagram for these states and use it to make your decision) Question 16 (Attempt 2) For the following two possible states of a substance, identify the conditions of pressure and temperature that would most favor the formation of state B (HINT: Build the PEC diagram for these states and use it to make your decision) Question 17 Select the path(s) that lead to changes in BOTH the average kinetic and potential energies of the particles that make up this substance: Question 17 (Attempt 3) Select the path(s) that lead to changes in BOTH the average kinetic and potential energies of the particles that make up this substance: Question 17 (Attempt 3) Select the path(s) that lead to changes in BOTH the average kinetic and potential energies of the particles that make up this substance: EXAM 2A