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

Find the formula unit mass of magnesium hydroxide, Mg(OH)₂.

Atomic mass — Mg = 24 u; O = 16 u; H = 1 u. [Pg. No. 180]

Answer: Verified

Given:

• Atomic mass of Mg = 24 u

• Atomic mass of O = 16 u

• Atomic mass of H = 1 u

Formula: Mg(OH)₂

Formula unit mass:

Formula unit mass of Mg(OH)₂ = 58 u

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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