I think it would be either dead bodies or rocks? i dont really understand too well but sorry if this doesn’t help!! :((
A physical property is any property that is measurable, whose value describes a state of a physical system. The changes in the physical properties of a system can be used to describe its changes between momentary states. Physical properties are often referred to as observables. They are not modal properties.
Answer:
fe3o4+4h2 - 3fe + 4h2o
therefore coefficient is 4
