Question

In a reaction, 5.3g of sodium carbonate reacted with 6 g of acetic acid. The products were 2.2 g of carbon dioxide, 0.9 g water and 8.2 g of sodium acetate. Show that these observations are in agreement with the law of conservation
of mass.

Sodium carbonate + acetic acid → Sodium acetate + carbon dioxide + water



​

Answer 1

Step-by-step explanation:

IN-TEXT QUESTIONS SOLVED

NCERT TEXTBOOK PAGE 32

1. In a reaction 5.3 g of sodium carbonate reacted with 6 g of ethanoic acid. The products were 2.2 g of carbon dioxide, 0.9 g water and 8.2 g of sodium ethanoate. Show that these observations are in agreement with the law of conservation of mass carbonate.

Ans.

Sodium carbonate + Ethanoic acid → Sodium ethanoate + Carbon dioxide + Water

5.3 g + 6 g → 8.2 g + 2.2 g + 0.9 g

LHS RHS

11.3 g = 11.3 g

(Mass of reactant) (Mass of product)

This shows, that during a chemical reaction mass of reactact = mass of product.

2. Hydrogen and oxygen combine in the ratio of 1 : 8 by mass to form water. What mass of oxygen gas would be required to react completely with 3 g of hydrogen gas?

Ans. Ratio of H : O by mass in water is:

Hydrogen : Oxygen → H2O

1 : 8 = 3 : x

x = 8 × 3

∴ 24 g of oxygen gas would be required to react completely with 3 g of hydrogen gas

Answer 2

Answer:

From the question,

$\huge{ \color{lime}Na_2CO_3+CH_3COOH→CO_2+H_2O+CH_3COONa}$

• Mass of reactants =5.3+6=11.3 gm

• Mass of products =2.2+0.9+8.2=11.3 gm

=:) During a chemical reaction, the mass of reactant = mass of the product.

hence Proven

Step-by-step explanation:

tq