Ijmb Model Questions Vol1 2020 Chemistry Question 1

Practice practical question 1 from the 2020 Ijmb Model Questions Vol1 Chemistry examination. This question covers Atomic Structure .

Ijmb Model Questions Vol1 2020 Chemistry Practical

Topic: Atomic Structure

Question 1 IJMB_MODEL_QUESTIONS_VOL1 • 2020 • CHEMISTRY • practical

A mass‑spectrometer was used to analyse a pure sample of an unknown element X. The instrument gave the following mass‑to‑charge (m/z) values and relative intensities: | m/z (amu) | Relative intensity (%) | |-----------|------------------------| | 32 | 95 | | 34 | 5 | The spectrometer was calibrated using a standard of known mass‑to‑charge ratio, and the detector response was linear over the range of interest.

Question Parts

( a )

State the approximate mass numbers of the isotopes of element X that are responsible for the observed peaks.

( b )

Calculate the average atomic mass of element X from the data given. Show all steps.

( c )

Identify element X and write its atomic number and group number in the periodic table. Justify your identification using the calculated average atomic mass.

( d )

List two possible sources of error that could affect the accuracy of the average atomic mass obtained from this experiment.

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About This Question

This is Ijmb Model Questions Vol1 2020 Chemistry Question 1. It is one of the practical questions from the 2020 Ijmb Model Questions Vol1 Chemistry examination.

The question covers Atomic Structure .

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