Question

An iron block had an initial mass of 100
grams. As the block rusted, its mass
increased. Which best explains why the
mass increased?
A
Oxygen combines with iron when rust
is formed.
B
Rust grows as it absorbs energy from
the block
C
Hydrogen is absorbed as rust forms on
the iron block.
D
Rust releases heat and makes the iron
expand.​

Answer 1

Answer:

A

Explanation:

Oxygen combines with iron when rust is formed,which likely increses

its mass.