Question

Following are atomic masses of a few elements in Balkon and the moleculoos formulae of some compounds. Deduce the molecular masses of of those compounds. Atomic masses - H(1), O (16), NC14). C(12), K (39), S (32), Ca (40), Na (23) CI(35.5) . Mg (24) , A1(27) Molecular formulae-NaCl, MgCl, KNO, H2O2 , ALCI 3 , Ca (OH)2, MgO, H2S04 ,HNO
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Answer 1

Answer:

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Answer 2

Answer:

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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