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WorksheetsMoles, Molar Mass, and Conversions
Total questions: 23
Worksheet time: 24mins
What is the molar mass of Cl2?
17 g/mol
35.5 g/mo;
71.0 g/mol
89 g/mol
What is the molar mass of the diatomic element nitrogen?
7 g/mol
14 g/mol
28 g/mol
Which compound has the smallest molar mass?
CO
CO2
H2O
H2O2
1 mole of Ca and 1 mole of Na have the same number of atoms.
True
False
What is an empirical formula?
Simplest whole-number ratio of a molecular formula
The actual formula of a molecule
The ionic formula of a compound
The formulas that only work in an empire state
What is percent composition?
The mass percentage of each element within a compound
The mole percentage of each element within a compound
The relative abundance of each isotope within an element
What is the difference between mass percent and percent composition?
There is no difference
Mass percent deals with mass while percent composition deals with moles
Mass percent is true sometimes, while percent composition is true always
Percent composition is more exact
What is the empirical formula for the following percents: Ca 54.05%, O 43.24%, H 2.70%?
CaOH
CaO2H2
Ca2O2H
CaOH2
What is the percent composition of NH4+?
N 77.62% H 22.38%
N 77.62% H 5.60 %
N 20% H 80%
N 94.40% H 5.60%
How does charge affect molar mass?
It doesn't; electrons are too small in mass compared to protons and neutrons
It doesn't; electrons have no mass and are the same for each compound
Electrons need to be added or subtracted from the mass after you calculate it
Electrons tell you the sign of your mass positive or negative
What is the molar mass of phosphate?
94.97 g/mol
46.97 g/mol
78.97 g/mol
94.97 amu/atom
What is the volume of 32.00 grams of oxygen gas at STP?
22.4 L oxygen gas
2.00 moles oxygen gas
44.8 L oxygen gas
6.02 x 1023 L oxygen gas
What is the empirical formula of the molecular formula C8H16O24
CH2O3
C8H16O24
C2H4O6
CHO
Determine the unknown element A in A2S if A is 70.92% and S is 29.08% by mass.
Potassium
Sodium
Copper
Gallium
What is the percent composition of C6H12O6?
CH2O
C 39.99% H 6.73% O 53.28%
C 25% H 50% O 25%
C 56.25% H 8.99% O 34.76%
