Start learning →

Indian Coast Guard Navik (Domestic) Mole Concept and Mass Percentage — practice questions

Explore 1 free Mole Concept and Mass Percentage questions in Indian Coast Guard Navik (Domestic) Science. Open each question or exercise to read its content, reference answers and available explanation.

Practise Mole Concept and Mass Percentage with Quill →

Mole Concept and Mass Percentage questions and exercises with answers

Showing questions 1–1 of 1.

What is the approximate percentage of oxygen by mass in Al₂(SO₄)₃?Read the answer and worked solution →

Worked practice questions

What is the approximate percentage of oxygen by mass in Al₂(SO₄)₃?

  1. 56.1%
  2. 57.7%
  3. 53.1%
  4. 52.6%
Show answer and solution

Correct answer: A. 56.1%

1. Molar mass: Al = 2×27 = 54, S = 3×32 = 96, O = 12×16 = 192. Total = 342. 2. Mass of oxygen = 192. 3. Percentage = 192 / 342 × 100 ≈ 56.1%. _Source: RRB Group D CEN-02/2018 PYQ, Q.6._

Open this question →

How to practise

  1. Choose a Mole Concept and Mass Percentage question and try to work out your answer.
  2. Open the question to check the correct answer and read its worked solution.
  3. Continue in the app for bite-sized lessons, explanations and review with Quill. You can start without creating an account.

More Science topics

Science & TechnologyPhysicsChemistryBiologyWork and EnergyPeriodic TableGravitationAcids, Bases and Salts