Stoichiometry IGCSE

The equation shows the reaction between magnesium and sulfuric acid. In this reaction, which mass of magnesium sulfate is formed when 6g of magnesium react with excess sulfuric acid?

• 8

• 24

• 30

• 60

Two atoms of magnesium, Mg, react with one molecule of oxygen, O2. What is the formula of the product?

• MgO

• MgO2

• Mg2O

• Mg2O2

What is the relative formula mass, Mr, of CaCO3?

• 50

• 68

• 100

• 204

A molecule, Z, contains two atoms of oxygen, six atoms of hydrogen and three atoms of carbon. What is the formula of Z?

• CH3CH2CHO

• CH3COCH3

• C2H5CO2H

• C3H6CO2H

What is the concentration of a solution containing 1.0g of sodium hydroxide in 250cm3 of solution?

• 0.025mol/dm3

• 0.10mol/dm3

• 0.25mol/dm3

• 1.0mol/dm3

Four students prepared hydrated copper(II) sulfate by adding an excess of dilute sulfuric acid to copper(II) oxide. Each student used a different mass of copper(II) oxide

• A

• B

• C

• D

20cm3 of ethyne, C2H2, are reacted with 500cm3 of oxygen. The equation for the reaction is

• 400cm3

• 450cm3

• 490cm3

• 520cm3

Which information is needed to calculate the relative atomic mass of an element?

• The total number of protons and neutrons in the most abundant isotope.

• The nucleon numbers and the total number of isotopes

• The mass number and abundance of each of its isotopes.

• The atomic number and abundance of each of its isotopes

The equation for the reaction between sodium carbonate and excess dilute hydrochloric acid is shown. When 26.5g of sodium carbonate reacts with excess dilute hydrochloric acid, what is the maximum volume of carbon dioxide produced?

• 6dm3

• 12dm3

• 18dm3

• 24dm3

A volumetric pipette is used to measure 25.0cm3 of 2.0mol/dm3 aqueous sodium hydroxide into a conical flask. A burette is filled with dilute sulfuric acid

• 0.50mol/dm3

• 1.0mol/dm3

• 2.0mol/dm3

• 4.0mol/dm3