WorksheetsMath in chemistry
Total questions: 15
Worksheet time: 15mins
Which formula is the empirical formula for ethane, C₂H₆?
CH₃
C₄H₁₂
C₂H₆
CH
Given a balanced equation representing a reaction: 2CO(g) + O₂(g) → 2CO₂(g) + energy. Which mass of O₂(g) reacts completely with 5.6 grams of CO(g) to produce 8.8 grams of CO₂(g)?
14.4 g
1.6 g
2.8 g
3.2 g
Given the balanced equation representing a reaction: 2KClO₃ → energy → 2KCl + 3O₂. What is the mass of KCl produced when 24.51 grams of KClO₃ reacts completely to produce 9.60 grams of O₂?
43.71 g
34.11 g
14.91 g
5.31 g
What is the gram-formula mass of Mg(NO₃)₂?
172 g/mol
134 g/mol
86 g/mol
148 g/mol
Given the balanced equation for the reaction of butane and oxygen: 2C₄H₁₀ + 13O₂ → 8CO₂ + 10H₂O + energy. How many moles of carbon dioxide are produced when 5.0 moles of butane react completely?
20. mol
10. mol
5.0 mol
40. mol
Given the balanced equation representing the reaction between methane and oxygen: CH₄ + 2O₂ → CO₂ + 2H₂O. According to this equation, what is the mole ratio of oxygen to methane?
2 grams O₂ / 1 gram CH₄
1 gram O₂ / 2 grams CH₄
2 moles O₂ / 1 mole CH₄
1 mole O₂ / 2 moles CH₄
One mole of bromine gas, Br₂, has a mass of
79.9 g
35.0 g
70.0 g
159.8 g
A solution contains 25 grams of KNO₃ dissolved in 200. grams of H₂O. Which numerical setup can be used to calculate the percent by mass of KNO₃ in this solution?
25g / 175g × 100
200g / 225g × 100
25g / 200g × 100
25g / 225g × 100
What is the number of moles in a 78.8-gram sample of MgCO₃ (gram-formula mass = 84.3 g/mol)?
0.935 mol
1.070 mol
0.843 mol
0.949 mol
Which numerical setup can be used to calculate the formula mass of C₉H₁₁NO₂?
12 u + 1 u + 14 u + 16 u
9(6 u) + 11(1 u) + 1(7 u) + 2(8 u)
9 u + 11 u + 1 u + 2 u
9(12 u) + 11(1 u) + 1(14 u) + 2(16 u)
What is the mass of 1.5 moles of CO₂?
66 g
44 g
33 g
29 g
A 2.5 L sample of SO₂(g) at STP and a 2.5 L sample of CO₂(g) at STP can be differentiated by comparing their
phases
temperatures
masses
volumes
Which term represents the sum of the atomic masses of the atoms in a molecule?
percent composition by mass
mass number
formula mass
atomic number
Which compound has the greatest percent composition by mass of sulfur?
MgS
SrS
BaS
CaS
Which two terms represent types of chemical formulas?
empirical and molecular
polar and nonpolar
synthesis and decomposition
saturated and concentrated
