WorksheetsQuiz 1-2
Total questions: 20
Worksheet time: 40mins
How many moles of N2(g) molecules would contain exactly 4.0 moles of nitrogen atoms?
1.0
2.0
3.0
4.0
Three stable isotopes of an element occur in nature. What is the average atomic mass of this element?
102.5
105.0
107.5
315.0
What is the molar mass of C2H6O?
29 g/mol
34 g/mol
46 g/mol
68 g/mol
Given the reaction:
(NH4)2CO3 → 2NH3 + CO2 + H2O
What is the minimum amount of ammonium carbonate that reacts to produce 1.0 mole of ammonia?
0.25 mol
0.50 mol
17 mol
34 mol
The number of moles of ammonia in 51.0 g of NH3 (MM = 17.0 g/mol) is
3.00 mol
3.40 mol
6.80 mol
867 mol
Magnesium reacts with aqueous silver nitrate to produce 2.16 g of silver metal in an experiment. What is the mass of magnesium reacted?
Mg + 2AgNO3 → 2Ag + Mg(NO3)2
0.242
0.325
0.650
2.16
The number of molecules of benzene, C6H6 (MM = 78.0 g/mol) present in 13.0 g is
A compound was found to contain 80% carbon and 20% hydrogen by mass. What is the empirical formula of this compound?
CH2
CH3
C2H
C3H2
The empirical formula of a compound is one where
all of the subscripts are > 1
only the molar ratios are given
the subscripts of all of the elements are 1
the atomic symbols are shown without subscripts
When the equation is balanced with small whole numbers the sum of the coefficients will be:
H2O + Cl2O → HOCl
3
4
5
6
The percentage by mass of oxygen in CO2 (MM = 44.0 g/mol) is
27.3%
36.4%
57.1%
72.7%
The molar mass of a compound with the empirical formula CH2O is 122 g/mol. What is the molecular formula of this compound?
C2H6O2
C3H3O6
C3H6O3
C4H8O4
The correct name for SO is _____.
sulfur oxide
sulfur monoxide
sulfoxide
sulfate
sulfite
The correct name for N2O5 is _____.
nitrous oxide
nitrogen pentoxide
dinitrogen pentoxide
nitric oxide
nitrogen oxide
The correct name for Na3N is _____.
sodium nitride
sodium azide
sodium trinitride
sodium (IX) nitride
trisodium nitride
The correct formula for bromic acid is _____.
HBr
HBrO4
HBrO
HBrO3
HBrO2
The correct formula for molybdenum (IV) hypochlorite is _____.
Mo(ClO3)4
MoClO4
Mo(ClO2)4
Mo(ClO4)4
MoCl4
Element M reacts with fluorine to form an ionic compound with the formula MF3. The M ion has 18 electrons. Element M is _____.
P
Sc
Ar
Ca
Cr
The correct formula for chromium (III) oxide is _____.
Cr2O3
CrO3
Cr3O2
Cr3O
Cr2O4
The correct formula for ammonium carbonate is _____.
(NH4)2CO3
NH4CO3
(NH3)2CO4
(NH3)2CO3
N2(CO3)3
