IB Chemistry: Stoichiometry

Which non-metal forms an oxide XO₂ with a relative molecular mass of 60?

• C

• N

• Si

• S

What will be the concentration of sulfate ions in moldm⁻³ when 0.20 mol of KAl(SO₄)₂ is dissolved in water to give 100 cm³ of aqueous solution?

• 0.2

• 1.0

• 2.0

• 4.0

The molar mass of a compound is approximately 56 g

mol⁻¹. Which formula is possible for this compound?

• NaNO₃

• AgOH

• MgO

• KOH

Which compound has the empirical formula with the largest mass?

• C₂H₆

• C₂H₄

• C₂H₂

• C₃H₆

What is the coefficient for O2(g) when the equation for the combustion of 1 mole of pentane is balanced?

C5H12(g) + _ O2(g) --> _ CO2(g) + _ H2O(g)

• 5

• 6

• 8

• 16

Tags

NGSS.HS-PS1-7

What is the maximum mass, in g, of magnesium oxide that can be obtained from the reaction of oxygen with 2.4 g of magnesium?

• 2.4

• 3.0

• 4.0

• 5.6

Tags

NGSS.HS-PS1-7

5 dm³ of carbon monoxide, CO(g), and 2 dm³ of oxygen, O₂(g), at the same temperature and pressure are mixed together. Assuming complete reaction according to the equation given, what is the maximum volume of carbon dioxide, CO₂(g), in dm³, that can be formed?

2CO(g) + O₂(g) → 2CO₂(g)

• 3

• 4

• 5

• 7

What volume of sulfur trioxide, in cm³, can be prepared using 40 cm³ sulfur dioxide and 20 cm³ oxygen gas by the following reaction? Assume all volumes are measured at the same temperature and pressure.

2SO₂(g) + O₂(g) → 2SO₃(g)

• 20

• 40

• 60

• 80

Which would be the best method to decrease the random uncertainty of a measurement in an acid-base titration?

• Repeat the titration

• Ensure your eye is at the same height as the meniscus when reading from the burette

• Use a different burette

• Use a different indicator for the titration

What is the sum of the coefficients that would balance this equation?

__ MnO₂ + __ HCl → __ MnCl₂ + __ Cl₂ + __ H₂O

• 6

• 7

• 9

• 10