Let a, b, and c be the coefficients in the balanced reaction:
a Fe + b Cl₂ → c FeCl₃
Count the atoms that show up among the reactants and products. They should be equal on both sides:
Fe : a = c
Cl : 2b = 3c
Let c = 2. Then a = 2 and 2b = 6, so b = 3.
Then the balanced reaction is
2 Fe + 3 Cl₂ → 2 FeCl₃
Answer:
C
Explanation:
(-2x-9y^2)(-4x-3)
Distributing -2x:
-2x * -4x = 8x^2
-2x * -3 = 6x
Distributing -9y^2:
-9y^2 * -4x = 36xy^2
-9y^2 * -3 = 27y^2
8x^2+6x +36xy^2 + 27y^2
I asked the same question and got this as an answer. Hope this helps! :)