Question

5. In an experiment, 9.6 g of sulphur burns completely in 9.6 g of oxygen to produce 19.2 g of sulphur dioxide. In another
experiment, 9.6 g of sulphur is made to burn completely in 100 g of oxygen. What mass of sulphur dioxide is formed.
Which law of chemical combination governs your answer?​

Answer 1

The mass of Sulphur dioxide is 109.6 grams and the law of conservation of mass governs the answer.

GIVEN

In an experiment, 9.6 g of sulphur burns completely in 9.6 g of oxygen to produce 19.2 g of sulphur dioxide. In another

experiment, 9.6 g of sulphur is made to burn completely in 100 g of oxygen.

TO FIND

What mass of sulphur dioxide is formed.

SOLUTION

We can simply solve the above problem as follows;

Reaction of Oxygen and sulphur is given by the reaction;

S + O₂ ---------> SO₂

Now it is given that,

9.6 sulphur burn completely with 9.6 grams of Oxygen to produce 19.2 grams of Sulphur dioxide.

The above reactions satisfies the law of conservation of mass, which states that, in a closed system, the mass of the system remains constant.

That is, Mass of reactants = Mass of Products.

Now,

Mass of sulphur given = 9.6 grams

Mass of Oxygen given = 100 grams

Total Mass of reactant = 109.6 grams

Applying law of conservation of mass;

Mass of product = Mass of reactant

Therefore,

Mass of Sulphur Dioxide formed = 109.6 grams

Hence, The mass of Sulphur dioxide is 109.6 grams and the law of conservation of mass governs the answer.

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