University:
Purdue University
Course:
CHM 62100 | Advanced Analytical Chemistry
Academic year:

2022
Views:

254

Pages:

2
Author:

Carissa Thomas

____________I - Multiple Choice - For each of the following, fill in the space on the answer sheet which corresponds to the one best answer. 1) How many 250.0 mg aspirin tablets can be prepared from 1.5 kg aspirin? a) 6.0 × 103 b) 6.0 c) 2.5 × 102 d) 1.5 × 103 e) 6 × 102 2) Platinum is one of the densest elements. Given that the density of platinum is 21.4 g/mL, what is the mass in pounds of 2.00 L of platinum? 1 kg = 2.205 lb a) 0.206 b) 2.14 × 104 c) 94.4 d) 4.28 × 104 e) 1.06 × 10-2 3) Isotopes are atoms which contain. . . a) equal numbers of protons, but different numbers of neutrons. b) equal numbers of protons, but different numbers of electrons. c) equal numbers of neutrons, but different numbers of protons. d) equal numbers of neutrons, but different numbers of electrons. e) the same number of neutrons as electrons. 4) A liquid has a density of 0.718 g/mL. How many mL of this liquid are needed to supply 5.00 g? a) 3.59 b) 6.96 c) 5.00 d) 0.718 e) 5.72 5) How many protons are contained in one molecule of N2O4? a) 6 b) 15 c) 46 d) 30 e) 34 6) How many electrons are contained in SO32-? a) 26 b) 38 c) 40 d) 24 e) 42 7) Which of the following is a metalloid? a) magnesium b) bromine c) silicon d) copper e) potassium 8) Which of the following statements is not true? a) 95 Mo contains 42 neutrons. b) V has an atomic number of 23. c) C has the same number of protons, neutrons and electrons. d) Zn has the same number of electrons and protons. e) Fe-56 contains 30 neutrons. 51 9) How many mol of carbon are present in 5.00 g C3H8? a) 0.340 b) 0.113 c) 12.0 d) 15.0 e) 1.25 10) What is the molar mass of NaOH? a) 23.0 g/mol b) 20.0 g/mol c) 11.0 g/mol d) 18.0 g/mol e) 40.0 g/mol 11) How many hydrogen atoms are present in 1.50 mol NH3? a) 2.71 × 1025 b) 2.71 × 1024 c) 9.03 × 1023 d) 1.50 e) 1.34 × 1023