Chem 101 Ivy Tech Midterm Exam|2025

Chemistry 101 Final Exam



What is the mass percent of hydrogen in water?



a: 5.60

b: 11.2

c: 33.3

d: 88.8 - correct answer -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 - correct answer -a



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 - correct answer -d



How many atoms are in 15.6 grams of silicon?



a: 0.555

b: 3.34 × 10^23

,Chemistry 101 Final Exam
c: 2.64 × 10^26

d: 438 - correct answer -b



What is the correct value for Avogadro's number?



a: 6.022 × 10^2.3

b: 6.022 × 10^33

c: 6.022 × 10^23

d: 6.023 × 10^22 - correct answer -c



The empirical formula for C6H6 is C3H3.



True

False - correct answer -False



Water is 11.2% hydrogen by mass.



True

False - correct answer -True



One mole of CO2 gas contains 1 mole of carbon atoms and 2 moles of oxygen atoms.



True

False - correct answer -True



Avogadro's Number is 6.022 × 1023.



True

, Chemistry 101 Final Exam
False - correct answer -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 - correct answer -b



What is the mass of 0.560 moles of chlorine gas?



a: 19.9

b: 39.7

c: 127

d: 63.3 - correct answer -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 - correct answer -a



How many molecules of sulfur trioxide are in 78.0 grams?



a: 5.87 × 10^23

b: 7.33 × 10^23

c: 0.974