Ijmb Model Questions Vol1 2025 Chemistry Question 1

Practice practical question 1 from the 2025 Ijmb Model Questions Vol1 Chemistry examination. This question covers Atomic Structure, Isotopic Abundance, Relative Atomic Mass .

Ijmb Model Questions Vol1 2025 Chemistry Practical

Topics: Atomic Structure Isotopic Abundance Relative Atomic Mass

Question 1 IJMB_MODEL_QUESTIONS_VOL1 • 2025 • CHEMISTRY • practical

A mass‑spectrometer was used to analyse a sample of chlorine gas. The instrument gave two peaks at mass‑to‑charge ratios (m/z) of 35 and 37 with relative intensities of 75 and 25 respectively. Using this data, answer the following questions.

Question Parts

( a )

Calculate the average atomic mass of chlorine from the experimental data.

( b )

State the percentage natural abundance of each isotope.

( c )

The accepted standard atomic mass of chlorine is 35.45 amu. Discuss why the experimental value (from part a) differs from the standard value.

( d )

Suggest two practical precautions that could improve the accuracy of the atomic‑mass determination.

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This is Ijmb Model Questions Vol1 2025 Chemistry Question 1. It is one of the practical questions from the 2025 Ijmb Model Questions Vol1 Chemistry examination.

The question covers Atomic Structure, Isotopic Abundance, Relative Atomic Mass .

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