The density of a large iron and a small piece of iron will be the same because of which of the following options?
a: they are both made of iron.
b: density is an intensive property.
c: both a and b.
d: they have the same mass and volume.

C

Explanation:

An intensive property doesnt depend on the amount of matter.

In this case if you have 1 kg of iron or 1 g of iron, intensive properties will always be the same.

The density is an intensive property.

the equation that correctly represent the reaction for formation of ammonia is

n2+ 3h2 → 2nh3 (answer d)

1 mole of nitrogen gas (n2) react with 3 moles of hydrogen gas (h2) to form 2 moles of ammonia ( nh3). this is in a process known as haber process were iron is used as a catalyst and reaction take place that a higher temperature and pressure. the process is exothermic hence energy is released.