4. Balance the following chemical equation. Say what the coefficients "a" and "b" are
2 Fe2O3 + 3 C → a Fe + b CO2

a = 4

b = 3

Explanation:

SOLUTION :-

Balance it by using 'hit & trial' method , and you'll get the answer :-

2Fe₂O + 3C → 4Fe + 3CO₂

⇒ a = 4 ; b = 3

VERIFICATION :-

In reactant side of equation :-

In product side of equation :-

Number of atoms of each element is equal in both reactant & product side of equation. Hence , the equation is balanced.

c. heat could easily travel through the molecules in the air and escape/enter the flask. removing the air slows down the heat transfer.