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Molecular Weight

In a chemical...

Question

In a chemical reaction, reactant A gets completely converted to B and C as shown below.
A $\to$ B + C

If the masses of A and C are 40 g and 10 g respectively, the mass of B will be ______.

A

20.5 g

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B

28 g

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C

30 g

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D

18 g

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Solution

The correct option is C 30 g
According to law of conservation of mass, the total mass of products is equal to total mass of reactants.
Mass of A = Mass of B + Mass of C

The mass of the reactant, A = 40 g.
Thus, total mass of products, i.e. mass of B + mass of C = 40 g.

$∴$ Mass of B = (mass of A) - (mass of C)
= 40 - 10 = 30 g.

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A

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If the masses of A and C are 40 g and 10 g respectively, the mass of B will be ______.

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Q. We know that balancing of a chemical equation is entirely based on law of conservation of mass. However the concept of Principle of Atom Conservation (POAC) can also be related to law of conservation of mass in a chemical reaction. So, POAC can also act as a technique for balancing a chemical equation. For example, for a reaction :

A B C_{3} \to A B + C_{2}

On applying POAC for A, B & C and relating the 3 equations, we get :

\frac{n_{A} B C_{3}}{2} = \frac{n_{A B}}{2} = \frac{n_{C_{2}}}{3}

n_{x} :

number of moles of X) Thus, the coefficients of

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in the balanced chemical equation will be 2, 2 & 3 respectively and the balanced chemical equation can be represented as :

2 A B C_{3} \to 2 A B + 3 C_{2}

Now answer the following question :

If the atomic masses of X and Y are 10 & 30 respectively, then the mass of

X Y_{3}

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X + Y_{2} \to X Y_{3}

Q. A decomposes under different environment separately to form B and C according to reactions:

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