The bones in the human body provides structure.
Answer: 
Explanation:
According to the law of conservation of mass, mass can neither be created nor be destroyed. Thus the mass of products has to be equal to the mass of reactants. The number of atoms of each element has to be same on reactant and product side. Thus chemical equations are balanced.
The balanced chemical equation for combustion of propane will be :

Answer:
a. Fe₂(SO₄)₃ + 6 KOH → 3 K₂SO₄ + 2Fe(OH)₃
b. 2 mol of KOH
c. 8 mol of Iron(II) hydroxide
Explanation:
This is the balanced reaction
Fe₂(SO₄)₃ + 6 KOH → 3 K₂SO₄ + 2Fe(OH)₃
b. Ratio is 3:6 so,
For 3 mol of potassium sulfate, I needed 6 mol of KOH
For 1 mol of potassium sulfate I would need (1 .6 )/3 = 2 mol of KOH
c. 1 mol of iron(III) sulfate, produce 2 mol of Iron(II) hydroxide
4 mol of iron(III) sulfate, will produce (4x2), 8 mol of Iron(II) hydroxide