JAMB Chemistry · Matter, atoms and chemical combination
Chemical combination: JAMB Chemistry Past Questions and Answers
What the JAMB syllabus covers in Chemical combination
Our summary: The laws of chemical combination, symbols, formulae and equations, relative atomic mass, the mole and reacting quantities.
- Laws of definite, multiple and reciprocal proportions, law of conservation of matter, chemical symbols, formulae, equations and their uses, relative atomic mass based on ¹²C = 12, the mole concept and stoichiometry of reactions
Objectives
- deduce the chemical laws from given expressions/statements/data;
- perform simple calculations involving formulae, equations/chemical composition and the mole concept; and
- deduce the stoichiometry of chemical reactions.
Syllabus content © The Joint Admissions and Matriculation Board (UTME).
JAMB Chemistry questions on Chemical combination
- JAMB 2025The relative molecular mass of an alkanoic acid with the empirical formula of CH 2 O is [ H = 1, C = 12, O = 16 ]
- JAMB 2025What is the molecular mass of an alkanoic acid, if 0.5 mole of the acid weighs 44g?
- JAMB 20252X + 2HCl → 2XCl + H 2 In the equation above, X is
- JAMB 2025How many molecules are there in 4.0 moles of glucose? [Avogadro's number = 6.02 x 10 ^ 23 ]
- JAMB 2025The empirical mass of C 6 H 12 O 6 is [H =1, C = 12, O = 16]
- JAMB 2024If 11.0g of a gas occupies 5.6 dm ^3 at s.t.p., calculate its vapour density (1 mole of a gas occupies 22.4 dm ^3 ).
- JAMB 2024The volume in cm ^3 of a 0.12 moldm ^ -3 HCl required to completely neutralize a 20cm ^3 of 0.20 moldm ^ -3 of NaOH is
- JAMB 2024The percentage of hydrogen in the sixth member of the class of the aliphatic alkanes is [H =1, C =12 ]
- JAMB 2024The law which states that a pure chemical compound, no matter how it is made, will be made up of the same elements contained in the same proportion by mass is
- JAMB 2024C 2 H 4(g) + 3O 2(g) → 2CO 2(g) + 2H 2 O (g) The above equation represents the combustion of ethene.If 10cm ^3 of ethene is burnt in 50cm ^3 of oxygen, what…
- JAMB 2024The molecular formular of a hydrocarbon with an empirical formula of CH 3 and a molar mass of 30 is
- JAMB 2024The empirical formula of an organic liquid hydrocarbon is XY. If the relative molar masses of X and Y are 72 and 6 respectively, it's vapour density is likely…
- JAMB 2024An organic compound contains 53.1% Carbon, 6.2% Hydrogen, 12.4% Nitrogen, and 28.3% Oxygen by mass. What is the molecular formula of the compound if its vapour…
- JAMB 2024The number of molecules of helium gas contained in 11.5g of the gas is
- JAMB 2024How many moles of CO 2 are produced when ethanol is burnt with 6g of oxygen
- JAMB 2024Determine the empirical formula of an oxide of sulphur containing 60% of oxygen [S = 32, O = 16 ]
- JAMB 2023What is the mass percentage of carbon (C) in methane (CH4)? (The molar mass of carbon is approximately 12 g/mol.)
- JAMB 2023Balance the following redox reaction: Fe 2 O 3 + CO → Fe + CO 2
- JAMB 2023What is the empirical formula of a compound containing 40.00% carbon, 6.67% hydrogen, and 53.33% oxygen by mass?
- JAMB 2023What is the molar mass of water (H2O)?
- JAMB 2022What volume of (dm ^3 ) of water will be added to 10dm ^3 of 2.0 mol/dm ^3 HCL acid solution to give a final solution of 0.5 mol/dm ^3 ?
- JAMB 2022An organic compound contains 69% carbon, 15.3% hydrogen and 30.7% oxygen. Calculate the the empirical formula [C=12, H = 1, O = 16]
- JAMB 20222H 2 + O 2 → 2H 2 O From the equation above, calculate the volume of unreacted oxygen gas if a mixture of 50cm ^3 of hydroden and 75cm ^3 of oxygen are involved
- JAMB 2021The mass of one Avogadro number of helium atoms is?
- JAMB 2021220g of carbon dioxide contains ----- moles
- JAMB 2020What mass of water is produced when 8.0g of hydrogen reacts with excess oxygen?
- JAMB 2020The number of molecules of Carbon(iv)Oxide produced when 10.0g of CaCO 3 is treated with 0.2dm ^3 of 1 Mole of HCL in the equation CaCO 3 + 2HCL ⇒ CaCl 2 + H 2…
- JAMB 20208g of CH 4 occupies 11.2 at S.T.P. What volume would 22g of CH 3 CH 2 CH 3 occupy under the same condition?
- JAMB 2020The volume occupied by 1.58g of a gas at S.T.P is 500cm ^3 . What is the relative molecular mass of the gas? [ G.M.V at S.T.P = 22.4dm ^ 3 ]
- JAMB 2019Which of the following gases contains the least number of atoms at s.t.p?
- JAMB 2019The electronic configuration of element Z is 1s ^2 2s ^2 2p ^6 3s ^2 3p ^1 . What is the formula of the compound formed between Z and tetraoxosulphate (VI) ion.
- JAMB 2019A certain hydrocarbon on complete combustion at s.t.p produced 89.6dm ^3 of CO 2 and 54g of water. The hydrocarbon should be?
- JAMB 2019A compound contains 40.0% carbon, 6.7% hydrogen and 53.3% oxygen. If the molar mass of the compound is 180. Find the molecular formula. [H = 1, C = 12, O = 16]
- JAMB 2019Elements X and Y have electronic configurations 1s ^2 2s ^2 2p ^4 and 1s ^2 2s ^2 2p ^6 3s ^2 3p ^1 respectively. When they combine, the formula of the compound…
- JAMB 2019In the reaction between sodium hydroxide and tetraoxosulphate (VI) solutions, what volume of 0.5 molar sodium hydroxide would exactly neutralize 10cm ^3 of 1.25…
- JAMB 2019200cm ^3 of 0.50mol/dm ^3 solution of calcium hydrogen trioxocarbonate (IV) is heated. The maximum weight of solid precipitated is
- JAMB 2019The combustion of carbon(II)oxide in oxygen can be represented by equation: 2CO + O 2 → 2CO 2 Calculate the volume of the resulting mixture at the end of the…
- JAMB 2018If 1 litre of 2.2M sulphuric acid is poured into a bucket containing 10 litres of water and the resulting solution mixed thoroughly, the resulting sulphuric…
- JAMB 2018A balanced chemical equation obeys the law of
- JAMB 2018In the reaction between sodium hydroxide and sulphuric acid solutions, what volume of 0.5 molar sodium hydroxide would exactly neutralise 10cm3 of 1.25 molar…
- JAMB 2018How many atoms are present in 6.0g of magnesium? [Mg = 24, N.A = 6.02 x 10 ^ 23 mol]
- JAMB 2018An element X forms the following compounds with chlorine; XCl 4 , XCl 3 , XCl 2 . This illustrates the
- JAMB 2018Calculate the percentage composition of oxygen in calcium trioxocarbonate(IV) [Ca=40, C=12, O=16]
- JAMB 2018What is the concentration of a solution containing 2g of NaOH in 100cm3 of solution? [Na = 23, O =16, H = 1]
- JAMB 2018What volume of oxygen will remain after reacting 8cm ^3 of hydrogen gas with 20cm ^3 of oxygen gas?
- JAMB 2017An oxide XO2 has a vapour density of 32. What is the atomic mass of X?
- JAMB 2016What volume of 0.5M H2SO4 will exactly neutralize 20cm3 of 0.1M NaOH Solution?
- JAMB 2016MnO 4 (aq) + Y + 5Fe ^ 2+ (aq) Mn ^ 2+ (aq) + 5Fe ^ 3+ (aq) + 4H 2 O (l). In the equation above, Y is
- JAMB 2016What is the concentration of a solution containing 2g of NaOH in 100cm3 of solution? [Na=23, O=16, H=1]
- JAMB 2015What volume of 0.5mldm3 H2SO4 will exactly neutralize 20cm3 of 0.1moldm3 NaOH Solution?
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