WorksheetsChem R Math of Chemistry Test Prep Quizziz
Total questions: 23
Worksheet time: 2hrs 55mins
A compound was analyzed and found to contain 75% carbon and 25% hydrogen by mass. What is the compound's empirical formula?
CH
CH2
CH3
CH4
What is the formula mass of Al2(SO4)3?
123
150
214
342
What is the percent composition by mass of nitrogen in the compound N2H4 (gram-formula mass = 32 g/mol)?
13%
44%
88%
93%
What is the percent composition by mass of nitrogen in (NH4)2CO3 (gram-formula mass = 96.0 g/mol)?
14.6%
29.2%
58.4%
87.5%
Given the equation representing a reaction:
2C + 3H2 → C2 H6
What is the number of moles of C that must completely react to produce 2.0 moles of C2H6?
1.0 mol
2.0 mol
3.0 mol
4.0 mol
Given the balanced equation representing a reaction:
C3H8(g) +5O2(g) 3CO2(g) + 4H2O(g)
What is the total number of moles of O2(g) required for the complete combustion of 1.5 moles of C3H8(g)?
.30 mol
1.5 mol
4.5 mol
7.5 mol
What is the total number of atoms contained in a 1.00-mole sample of helium?
1.00 atom
2.00 atoms
1.20 × 1024 atoms
6.02 × 1023 atoms
What is the total number of neon atoms contained in 20.2 grams of neon gas?
1.01 × 1024
2.02 × 1024
3.01 × 1023
6.02 × 1023
Which formula is the empirical formula for ethane, C2H6?
CH
CH3
C2H6
C4H12
Which term represents the simplest whole number ratio of atoms of the elements in a compound?
atomic mass
formula mass
empirical formula
structural formula
What is the empirical formula for a compound with the molecular formula C6H12Cl2O2?
CHClO
CH2ClO
C3H6ClO
C6H12C12O2
The compounds C2H4 and C4H8 have the same
freezing point at standard pressure
boiling point at standard pressure
molecular formula
empirical formula
What is the molecular formula for CH3CH2COOCH3?
C2H4O
C2H4O2
C4H8O
C4H8O2
Which molecular formula is also an empirical formula?
C6H6
H2O2
N2H4
N2O5
Which numerical setup can be used to calculate the formula mass of C9H11NO2?
9 u + 11 u + 1 u + 2 u
12 u + 1 u + 14 u + 16 u
9(6 u) + 11(1 u) + 1(7 u) + 2(8 u)
9(12 u) + 11(1 u) + 1(14 u) + 2(16 u)
What is the gram-formula mass of Mg(NO3)2?
86 g/mol
134 g/mol
148 g/mol
172 g/mol
What is the mass of 1.5 moles of CO2?
66 g
44 g
33 g
29 g
What is the number of moles of CO2 in a 220.-gram sample of CO2 (gram-formula mass = 44 g/mol)?
0.20 mol
5.0 mol
15 mol
44 mol
The total number of moles represented by 20 grams of CaCO3 is
1
2
0.1
0.2
A compound has a molar mass of 90. grams per mole and the empirical formula CH2O. What is the molecular formula of this compound?
CH2O
C2H4O2
C3H6O3
C4H8O4
A compound has a gram formula mass of 56 grams per mole. What is the molecular formula for this compound?
CH2
C2H4
C3H6
C4H8
What is the empirical formula of a compound that contains 30.4% nitrogen and 69.6% oxygen by mass?
NO
NO2
N2O3
N2O5
A compound was analyzed and found to contain 75% carbon and 25% hydrogen by mass. What is the compound's empirical formula?
CH
CH2
CH3
CH4
