Chem 101 Final Exam Questions With Correct Answers
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Course
Chem 101
Institution
Chem 101
Chem 101 Final Exam Questions With Correct Answers
Determine the formula weight of KBr - ANSWER- 119.00 amu
Determine the mass in grams of 3.00 x 10^21 atoms of arsenic. (The mass of one mole of arsenic is 74.92 g.) - ANSWER- 0.373 g
Fill in the blank: A mole is defined as the number of ...
Chem 101 Final Exam Questions With
Correct Answers
Determine the formula weight of KBr - ANSWER- 119.00 amu
Determine the mass in grams of 3.00 x 10^21 atoms of arsenic. (The mass of one mole
of arsenic is 74.92 g.) - ANSWER- 0.373 g
Fill in the blank: A mole is defined as the number of carbon atoms in _____ g of pure
^12C. - ANSWER- 12
How many atoms are in 1.2 mol of carbon? - ANSWER- 7.2264 x 10^23
Which one of the following contains the most moles of oxygen atoms?
A) 1 mol of Fe(C2H3O2)3
B) 1 mol of Na3PO4
C) 2 mols of Ca(NO2)2
D) 3 mol of CH3OH - ANSWER- C) 2 mols of Ca(NO2)2
Determine the molar mass of CH3OH. - ANSWER- 32.04 g/mol
Determine the number of atoms of O in 92.3 moles of Cr3(PO4)2 - ANSWER- 4.45 x
10^26 atoms
How many atoms of vanadium are in 1.28 grams of vanadium? - ANSWER- 1.51 x
10^22 atoms of V
What is the molecular formula of a compound that contains only carbon and hydrogen,
is 85.6% carbon, and has a molar mass of 70g/mol?
A) CH2
B) C5H10
C) C5H5
D) C4H21 - ANSWER- B) C5H10
A compound that contains only carbon, hydrogen, and oxygen is 58.8% C and 9.87% H
by mass. What is the empirical formula of this substance?
A) C2*5H50
B) C5H10O2
C) C6H4O
D) C4H8O2
E) C5H5O2 - ANSWER- B) C5H10O2
What is the mass percentage of Cl in hydrochlorothiazide, C7H8ClN3O4S2? -
ANSWER- 11.91 %
, What is the mass percentage of C in morphine, C17H19NO3? - ANSWER- 71.56 %
An iron-containing compound is 20.1% Fe, 11.5% S, 63.3% O, and 5.1% H. What is the
empirical formula for this compound?
A) Fe3SO19H25
B) Fe15S9O50H
C) FeS2O22H28
D) FeSO11H14 - ANSWER- D) FeSO11H14
100.0 mL of a 0.500 M solution of KBr is diluted to 500.0 mL. What is the new
concentration of the solution? - ANSWER- 0.100 M
How many mL of 0.300 M NaCl solution are required to produce 0.150 moles of NaCl? -
ANSWER- 500 mL
How many moles of CH3OH are there in 50.0 mL of 0.400 M CH3OH? - ANSWER-
0.0200 mol
To what volume would you need to dilute 20.0 mL of a 1.40 M solution of LiCN to make
a 0.900 M solution of LiCN? - ANSWER- 311 mL
If 50.0 g of CH3OH (MM=32.04 g/mol) are dissolved in 500.0 mL of solvent, what is the
concentration of CH3OH in the resulting solution? - ANSWER- 3.12 M
What is the empirical formula for methamphetamine?
A) C10H15N
B) C10H12N
C) C9H15N
D) C10H14N
E) Cannot be determined. - ANSWER- A) C10H15N
What is the molecular formula of a compound with an empirical formula of CH and a
molar mass of 78.1 g/mol?
A) C6H
B) C2H2
C) C2H6
D) C6H6 - ANSWER- D) C6H6
What is the empirical formula of a compound that contains only iron and oxygen and is
22.27% oxygen?
A) FeO
B) FeO2
C) Fe2O
D) Fe7O2 - ANSWER- A) FeO
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