Answer:
The answer to your question is the third choice.
Explanation:
CaCO₃ ⇒ CaO + CO₂
Check if the reaction is balanced or unbalanced
Reactants Elements Products
1 Calcium 1
1 Carbon 1
3 Oxygen 3
As the number of atoms in the reactant is the same that the number of atoms in the products we conclude that the reaction is balanced.
So the correct answer is balanced because the total number of oxygen atoms is 3.
Answer:
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You need 158.70 grams of Fe2O3 to produce 111 grams of Fe. This is calculated by using the molar masses and stoichiometric relationship of the two compounds.
Solution:
MM Fe = 55.845 g/mol
MM Fe2O3 = 159.69 g/mol
Fe: Fe2O3 = 2 mol:1 mol
11 g FE (1 mol Fe/55.845 g Fe) (1 mol Fe2O3/2 mol Fe) (159.69 g Fe2O3 / 1 mole Fe2O3) = 158.70 grams Fe2O3
On Earth it is relatively rare—5.2 ppm by volume in the atmosphere. Most terrestrial helium<span> present today is created by the natural radioactive decay of heavy radioactive elements (thorium and uranium, although there are other examples), as the alpha particles emitted by such decays consist of </span>helium<span>-4 nuclei.</span>
