Calcium carbonate breaks down on heating to produce calcium oxide and carbon dioxide gas.
CaCO3 ® CaO + CO2
A student heats 15 g of calcium carbonate strongly in a crucible.
Relative atomic masses (Ar): Ca = 40, C = 12, O = 16.
4 / 4
a Calculate the number of moles in 15 g of calcium carbonate. (2 marks)
b Use your answer to part a to determine the number of moles of calcium oxide that will be produced. (1 mark)
c Calculate the mass of calcium oxide produced by this reaction. (2 marks)
4 A student is preparing a sample of sodium nitrate, NaNO3.
She mixes 17 g of sodium oxide with an excess of nitric acid. The equation for the reaction is:
Na2O + 2HNO3 ® 2NaNO3 + H2O
Relative atomic masses (Ar): Na = 23, O = 16, N = 14, H = 1.
a Calculate the number of moles in 17 g of sodium oxide. (2 marks)
b Calculate the maximum mass of sodium nitrate that can be produced in this reaction. (3 marks)
5 Aluminium and iron oxide (Fe2O3) react together to produce aluminium oxide (Al2O3). The equation for the reaction is:
2Al + Fe2O3 ® Al2O3 + 2Fe
Calculate the mass of iron that is produced by reacting 20 g of iron oxide with an excess of aluminium.
Relative atomic masses (Ar): Al = 27, O = 16, Fe = 56. (4 marks)
Answers: 1
Chemistry, 22.06.2019 09:10
Which class of molecules functions as chemical signals? hormones water carbohydrates proteins
Answers: 1
Chemistry, 22.06.2019 10:50
Determine the empirical formula for succinic acid that is composed of 40.60% carbon, 5.18% hydrogen, and 54.22% oxygen.
Answers: 1
Chemistry, 22.06.2019 13:00
Adepositional also feature that forms where a stream enters a lake or an ocean is a
Answers: 2
Chemistry, 22.06.2019 15:30
Plz me ! 1 which of earths spheres contains most of its mass? a atmosphere b hydrosphere c geosphere* d biosphere 2 erosion and weathering are examples of which types of forces? a constructive forces b destructive forces* c gravitational forces d inertia-related forces 3 which of the following statements about earths atmosphere is true? a earths atmosphere contains 78% water vapor which is essentail to life b earths atmosphere contains 21% oxygen c earths atmosphere contains carbon dioxide which all life forms require d earths atmosphere allows radiation from the sun to pass through it and warm earths surface* 4 the strenght of the force of gravity between two objects is determined by which of the following factors? select all that apply a the messes of the objects* b the distance between the objects* c the volumes of the objects d the surface area of the objects 5 earth and moon are kept in there respective orbits due to the influence of a inertia b gravity c gravity and inertia* d neither gravity or inertia if you answer all questions right i will give
Answers: 1
Calcium carbonate breaks down on heating to produce calcium oxide and carbon dioxide gas.
CaCO3 ® C...
Mathematics, 29.10.2020 19:40
Mathematics, 29.10.2020 19:40
Mathematics, 29.10.2020 19:40
English, 29.10.2020 19:40
History, 29.10.2020 19:40
History, 29.10.2020 19:40
History, 29.10.2020 19:40
Mathematics, 29.10.2020 19:40
History, 29.10.2020 19:40
Mathematics, 29.10.2020 19:40
English, 29.10.2020 19:40
Mathematics, 29.10.2020 19:40
English, 29.10.2020 19:40
Mathematics, 29.10.2020 19:40