Magnesium (Mg) and sulfur (S) combine to form magnesium sulfide (MgS) according to the reaction: Mg + s → From atomic masses: Magnesium (Mg) = 24 g/mol Sulfur (S) = 32 g/mol The ratio of magnesium to sulfur in MgS is:
Discussion Forum Latest Questions
(a) +3 and -3 respectively. Aluminium (Al) has a valency of +3 because it loses three electrons to achieve stability. Phosphate (PO₄³⁻) has a valency of -3 as it gains three electrons. They combine to form AlPO₄ in a neutral ...
The correct answer is (b) John Dalton. John Dalton proposed the first atomic theory in the early 19th century, which stated that matter is made up of indivisible particles called atoms, and that atoms of the same element are identical ...
The correct answer is (c) atomic mass units. The relative mass of a molecule is expressed in atomic mass units (amu) or daltons (Da). This unit compares the mass of a molecule to the mass of an atom of carbon-12, ...
The correct answer is (c) law of conservation of mass. This law, proposed by Antoine Lavoisier, states that mass cannot be created or destroyed in a chemical reaction. The total mass of reactants before a reaction is equal to the ...