Question

In an experiment 15.95g of copper sulphate reacted with 8.0g of sodium hydroxide to form 9.75g of copper hydroxide and 14.2g of sodium sulphate. Which law of chemical composition is illustrated by this data? Give suitable reason for your answer.

Answer 1

Answer:

Both 2N and N2 are the forms of nitrogen. 2N denotes two separate atoms of

nitrogen whereas N2 denotes one molecule of nitrogen gas.

35. Question

What do the following abbreviation stand for?

(a) O (b) 2O (c) O2

(d) 3O2

Answer

(a) O - one atom of oxygen

(b) 2O - two separate atoms of oxygen

(c) O2

- one molecule of oxygen gas

(d) 3O2

- three molecules of oxygen

36. Que

Explanation:

Answer 2

Answer:

In the given reaction, The Law of Conservation of Mass is illustrated· Because here, the total mass of the reactants is equal to the total mass of the products· Thus, it follows The  Law of Conservation of Mass·

Explanation:

The balanced chemical equation for the given reaction follows,

  $CuSO_4\ +\ 2\ NaOH\ --->\ Cu(OH)_2\ +\ Na_2SO_4$

Given that,

The mass of Copper sulfate reacted $=$ $15.95$  g

The mass of Sodium hydroxide reacted $=$ $8.0$ g

The mass of  Copper hydroxide produced  $=$ $9.75$ g

The mass of sodium sulfate  produced  $=$ $14.2$ g

Here,

The total mass of the reactants  $=$  $15.95$  g  $+$  $8.0$ g  $=\ 23.95$ g

The total mass of the products  $=$  $9.75$ g  $+$  $14.2$ g  $=\ 23.95$ g

According to the Law of Conservation of Mass,

The total mass of the reactant   $=$  The total mass of the product

Here also the total mass of the reactants is equal to the total mass of the products which is equal to the $23.95$ g·

Thus, the given reaction follows The  Law of Conservation of Mass·

So in the given reaction, The Law of Conservation of Mass is illustrated·