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LenaWriter [7]
3 years ago
15

Is the number of total molecules on the left side of a balanced equation always equal to the number of total molecules on the ri

ght side of the equation
Chemistry
1 answer:
Nadya [2.5K]3 years ago
3 0

Answer:

No

Explanation:

No, but the total mass of reactants must equal the total mass of products to be a balanced equation.

Example: Consider the following reaction ...

3H₂ + N₂ => 2NH₃ and 'amu' is atomic mass units (formula weights from periodic table)

In terms of molecules, there are 4 molecules on the left (3 molecular hydrogens (H₂) and 1 molecular nitrogen (N₂) and 2 molecules of ammonia on the right side of equation arrow. ∑reactant molecules ≠ ∑product molecules.

In terms of mass of reactants & mass of products, the 3H₂ + N₂ => 6amu + 28amu = 34amu & mass of products (2NH₃) => 2(14amu) + 6(1amu) = 34amu for sum of product masses.

∑mass reactants = ∑mass products <=> 34amu = 34amu.

The expression '∑mass reactants = ∑mass products' as applied to chemical equations is generally known as 'The Law of Mass Balance'.

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2 years ago
Fe2O3 + CO → Fe + CO2 If 3 moles of Fe2O3 react with 1.5 moles of CO, how many moles of each product are formed? (3 points)
Dima020 [189]

Answer:

A. 1 mole of Fe.

B. 1.5 moles of CO₂.

Explanation:

We'll begin by writing the balanced equation for the reaction. This is illustrated below:

Fe₂O₃ + 3CO —> 2Fe + 3CO₂

From the balanced equation above,

1 mole of Fe₂O₃ reacted with 3 moles of CO to produced 2 moles of Fe and 3 moles of CO₂.

Next, we shall determine the limiting reactant. This can be obtained as follow:

From the balanced equation above,

1 mole of Fe₂O₃ reacted with 3 moles of CO.

Therefore, 3 moles of Fe₂O₃ will react with = 3 × 3 = 9 moles of CO.

From the calculation made above, we can see clearly that it will require a higher amount (i.e 9 moles) of CO than what was given (i.e 1.5 moles) to react completely with 3 moles of Fe₂O₃.

Therefore, CO is the limiting reactant and Fe₂O₃ is the excess reactant.

A. Determination of the number of mole of Fe produced.

NOTE: The limiting reactant is used to obtain the desired result because it will give the maximum yield of the products since all of it is consumed in the reaction.

From the balanced equation above,

3 moles of CO reacted to produced 2 moles of Fe.

Therefore, 1.5 moles of CO will react to produce = (1.5 × 2)/3 = 1 mole of Fe.

Thus, 1 mole of Fe was obtained from the reaction.

B. Determination of the number of mole of CO₂ produced.

From the balanced equation above,

3 moles of CO reacted to produced 3 moles of CO₂.

Therefore, 1.5 moles of CO will also react to produce 1.5 moles of CO₂.

Thus, 1.5 moles of CO₂ were obtained from the reaction.

6 0
3 years ago
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