C! The clownfish hide in the sea anemones for protection
Answer:
The mass of iron needed to react with the oxygen is 70 g.
Explanation:
The balanced chemical reaction between iron and oxygen is given as;
4Fe + 3O₂ ----------> 2Fe₂O₃
Molecular mass of 3O₂: 3(16 x 2) = 96 g
Molecular mass of 4Fe: 4(56) = 224 g
96 g of O₂ ---requires--------> 224 g of Fe
30 g of O₂ -------requires--------->? Fe
= (30 x 224) / 96
= 70 g
Therefore, the mass of iron needed to react with the oxygen is 70 g.
The system which leads to drought is high pressure system.
<h3>What is drought?</h3>
Drought refers to a situation in which there is no precipitation in an area over a long period of time. It usually results is unusually hot and dry for several weeks.
This condition of drought is usually caused by a high pressure system which leads to the drought.
Learn more about drought: brainly.com/question/2791517