WorksheetsUnit 6 Exam Review
Total questions: 20
Worksheet time: 3hrs 20mins
How many moles are in 4.5x1024 particles?
0.747 particles
2.71x1047 mol
0.747 mol
2.71x1047 particles
What is a mole?
6.022 x 1023 particles of any substance
A small burrowing animal
A dark spot on your skin
A spy
An element's molar mass can be found on what part of an element's entry on the periodic table?
atomic number
atomic mass
group number
it can't be found on the periodic table
How many particles would be in 8.4 moles of Octane (C8H18)? (molar mass of octane = 114.23)
5.77 x 1023
5.04 x 1024
5.77 x 1026
5.04 x 1023
What is the percent composition of sodium in NaCl? (molar mass of NaCl = 58.44g)
39%
61%
35%
65%
What is the percent composition of magnesium in MgO? (Molar mass of MgO = 40.30g)
20%
40%
50%
60%
What is the percent by mass of fluorine in CaF2 , which has a molar mass of 78 g/mol)?
24%
49%
51%
65%
What is the percent composition of benzene, C6H6? (Molar mass of C6H6 = 78.11g)
C = 50.%
H = 50.%
C = 85.7 %
H = 14.3%
C = 92.2%
H = 7.8%
C = 71.9%
H = 28.1%
Which pair shows both the empirical and molecular formula?
NaCrO4 and Na2Cr2O7
C2H4O2 and C6H12O6
C3H6O3 and C2H6O2
CH4 and C2H6
What is the empirical formula for C2H4?
CH
CH2
C4H2
C2H4
What is the empirical formula for C25H45?
C25H45
CH
C5H9
C9H5
Which of the following statements regarding the mole is INCORRECT?
A mole is a unit of quantity equal to 6.02 x 1023 particles.
The number of particles in a mole is known as Avogadro’s number.
A mole of particles of an element is numerically equal to the atomic mass of the element.
none of the above
The mass of one mole of an element is equal to
its atomic number from the periodic table, but in amus.
its atomic mass from the periodic table, but in amus.
its atomic mass from the periodic table, but in grams.
its atomic number from the periodic table, but in grams.
