NCERT Class 9 Science Chapter 3 Atoms and Molecules Solutions
NCERT Class 9 Science Chapter 3 Atoms and Molecules Solutions INTEX QUESTIONS AND ANSWERS Textbook Page No. 32-33 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. Sodium carbonate + ethanoic acid log → sodium ethanoate + carbon dioxide + water Ans. Total massa of the reactants = Mass of sodium carbonate+Mass of ethanoic acid = 5.3g+6g = 11.3g Total mass of the products = Mass of carbon dioxide + Mass of water + Mass of sodium ethanoate = 2.2g + 0.9g + 8.2g = 11.2g Since the total mass of the reactants is equal to the total mass of the products, these observations are in agreement with the law of conservation of mass. 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 3g of hydrogen gas? Ans. 1 g ...