Chapter 9
Atomic Foundations of Matter
CBSE Class 9
Science Solutions
Educart Science class Class 9 NCERT Exemplar cover
Question:

When 20 g of hydrogen reacts completely with 160 g of oxygen, how much water is formed according to the Law of Conservation of Mass? [Pg. No. 166]

Answer: Verified

According to the Law of Conservation of Mass, the total mass of the reactants is equal to the total mass of the products.

Mass of hydrogen = 20 g

Mass of oxygen = 160 g

Total mass of reactants = 20 g + 160 g = 180 g

Therefore, the mass of water formed = 180 g

180 g of water is formed.

The Law of Conservation of Mass states that mass is neither created nor destroyed during a chemical reaction. Hence, the total mass remains 180 g before and after the reaction.

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More NCERT Questions
Metal M, with two electrons in its valence shell (M shell), reacts with oxygen to form a compound that is slightly soluble in water. Predict its: (A) formula (B) type of bond (C) electrical conductivi Find the molecular mass of nitric acid (HNO3). Atomic mass — H = 1 u; N = 14 u; O = 16 u. [Pg. No. 179] Find the molecular mass of methane (CH₄). Atomic mass — C = 12 u; H = 1 u. [Pg. No. 179] An element X has six electrons in its outer shell and forms a diatomic molecule. (A) Why would that be so? (B) What kind of bond would it form? (C) Draw the structure of the molecule it would form. (D