A sample of iron weighs more after it rusts because
A)it has expanded into a greater volume.
B)rust contains twice as many iron atoms.
C)of the additional oxygen it contains.
D)Wrong.Iron actually weighs less after it rusts.

Question

Quizplus · Accepted Answer

Rust is formed when iron reacts with oxygen in the presence of water, which results in the formation of hydrated iron(III) oxide, or rust. As rust is formed, oxygen is added to the iron, leading to an increase in mass. Therefore, the correct answer is C - the additional oxygen it contains. Option A is incorrect as rust forms within the iron lattice, which doesn't increase the volume of iron. Option B is incorrect as rust doesn't contain twice as many iron atoms, in fact, it contains fewer iron atoms than pure iron. Finally, option D is incorrect as iron weighs more after rusting, not less.

A Sample of Iron Weighs More After It Rusts Because