Chemistry 101 Final Exam Ivy Tech Practice Questions and Answers

Chemistry 101 Final Exam Ivy Tech Practice Questions and Answers What is the mass percent of hydrogen in water? a: 5.60 b: 11.2 c: 33.3 d: 88.8 - Ans:-b How many atoms are in 5.80 moles of He? a: 3.49 × 10^24 b: 6.02 × 10^23 c: 1.03 × 10^23 d: 4.00 - Ans:-a ©GRACEAMELIA 2024/2025 ACADEMIC YEAR. ALL RIGHTS RESERVED FIRST PUBLISH OCTOBER 2024 Page 2/30 What is the value of n when the empirical formula is C3H5 and the molecular mass is 205.4 g/mol? a: 10 b: 0.02 c: 140 d: 5 - Ans:-d How many atoms are in 15.6 grams of silicon? a: 0.555 b: 3.34 × 10^23 c: 2.64 × 10^26 d: 438 - Ans:-b What is the correct value for Avogadro's number? ©GRACEAMELIA 2024/2025 ACADEMIC YEAR. ALL RIGHTS RESERVED FIRST PUBLISH OCTOBER 2024 Page 3/30 a: 6.022 × 10^2.3 b: 6.022 × 10^33 c: 6.022 × 10^23 d: 6.023 × 10^22 - Ans:-c The empirical formula for C6H6 is C3H3. True False - Ans:-False Water is 11.2% hydrogen by mass. True False - Ans:-True One mole of CO2 gas contains 1 mole of carbon atoms and 2 moles of oxygen atoms. ©GRACEAMELIA 2024/2025 ACADEMIC YEAR. ALL RIGHTS RESERVED FIRST PUBLISH OCTOBER 2024 Page 4/30 True False - Ans:-True Avogadro's Number is 6.022 × 1023. True False - Ans:-True A 500. gram iron ore sample was determined to contain 242 grams of iron. What is the mass percent of iron in the ore? a: 32.6 b: 48.4 c: 51.6 d: 93.7 - Ans:-b What is the mass of 0.560 moles of chlorine gas? ©GRACEAMELIA 2024/2025 ACADEMIC YEAR. ALL RIGHTS RESERVED FIRST PUBLISH OCTOBER 2024 Page 5/30 a: 19.9 b: 39.7 c: 127 d: 63.3 - Ans:-b How many molecules of nitrogen monoxide are in a 22.5 gram sample? a: 4.51 × 10^23 b: 7.33 × 10^23 c: 4.06 × 10^23 d: 5.86 × 10^23 - Ans:-a How many molecules of sulfur trioxide are in 78.0 grams?