WorksheetsUnit 6 - Practice Quiz
Total questions: 26
Worksheet time: 29mins
The formula mass of ammonium phosphate, (NH4)3PO4, is
113.012 amu
141.04 amu
149.12 amu
169.14 amu
In which of the following molar quantities of sulfur would 8.13 x 1023 atoms of sulfur be present?
1.15 moles S
1.25 moles S
1.35 moles S
1.45 moles S
Which of the following samples has the largest mass, in grams?
2 moles of CO2
3 moles of CO
4 moles of H2O
5 moles of H2
Which of the following statements concerning Avogadro's number is correct?
It has the value 6.02 x 10-23.
It denotes the number of molecules in one mole of any molecular substance.
It is the mass, in grams, of one mole of any substance.
It denotes the number of atoms in one mole of any substance.
5.80 g of dioxane (C4H8O2) is equal to how many moles of dioxane?
0.0658 mol
0.0707 mol
0.0725 mol
0.0804 mol
How many molecules of tetrahydrofuran (C4H8O) are present in 2.00 x 10-9 mol of tetrahydrofuran?
1.67 x 1013 molecules
3.01 x 1014 molecules
1.20 x 1015 molecules
2.17 x 1016 molecules
Compute the percent by mass of carbon in a compound with the empirical formula C2H2O.
28.57%
40.00%
57.14%
80.00%
A 50.00-g sample of a compound is analyzed and found to contain 21.85 g of phosphorus and 28.15 g of oxygen. The empirical formula for this compound is
PO3
P2O
P3O2
P2O5
At STP, 1.00 mole of any gas occupies a volume of _________. This quantity is referred to as "molar volume" (L/mol).
22.4 L
6.02 x 1023 L
44.8 L
18.02 L
What does STP mean?
Standard Temperature and Pressure
Standard Temperature and Particles
Standard Time and Pressure
Standard Time and Particles
What are the values for STP?
0°C and 1 atm
100°C and 1 atm
0K and 1 atm
100K and 1 atm
Which of the following is NOT an example of a representative particle?
atoms
molecules
formula units
grams
The mass of a mole of any substance is called ______________.
molar mass
molar volume
atomic mass
formula mass
How many hydrogen atoms are in 4 molecules of isopropyl alcohol, C3H8O?
4
4 x (6.02 x 1023)
32
32 x (6.02 x 1023)
The chemical formula for aspirin is C9H8O4. What is the mass of 0.200 mol of aspirin?
22.5 g
5.42 g
80.0 g
36.0 g
What is the volume of 2.50 mole of carbon monoxide being held at STP?
0.112 L
3.10 L
56.0 L
8.96 L
What is the molar mass of molecular oxygen?
equal to the mass of one mole of oxygen atoms.
16.0 g.
32.0g
none of the answer choices
Which of the following is NOT an empirical formula?
Na2SO4
C6H5Cl
N2H4
Sn3(PO4)4
A compound has the empirical formula C2H3O and a molar mass of 172.0 g/mol. What is its molecular formula?
C6H9O3
C8H12O4
C9H16O3
C7H8O5
The empirical formula of a compound is CH2F. The molar mass of this compound is 66.0 g. What is its molecular formula?
C4H8F4
C4H4F4
C2H4F2
CH2F
A(n) ___________ formula is found with the lowest whole number ratio of elements in a compound.
empirical
molecular
A(n) ___________ formula shows the exact kind and number of atoms found in the compound.
empirical
molecular
A compound is found to have 75% C and 25% H. What is the empirical formula?
CH
C2H3
CH2
CH4
Which of the following is the empirical formula for C8H18?
C2H6
CH2
C4H9
C8H18
What is the name for the following compound, CrBr3 * 6H2O?
chromium bromide hexahydrate
chromium(III) bromide hexahydrate
chromium(I) tribromide hexahydrate
chromium tribromide hexahydrate
What is the correct molecular formula for the compound, barium hydroxide octahydrate?
BaO * 8H2O
BaOH * 8H2O
Ba(OH)2 * 8H2O
BaH * 8H2O
