Waec Model Questions Vol1 2019 Chemistry Question 1

Practice practical question 1 from the 2019 Waec Model Questions Vol1 Chemistry examination. This question covers Atomic Structure .

Waec Model Questions Vol1 2019 Chemistry Practical

Topic: Atomic Structure

Question 1 WAEC_MODEL_QUESTIONS_VOL1 • 2019 • CHEMISTRY • practical

A student performed a mass‑spectrometric analysis of a chlorine sample. The instrument gave the following peak heights: - Mass 35 u : 760 units - Mass 37 u : 240 units The detector is known to be 5 % less sensitive for ions of mass 37 u than for ions of mass 35 u. Using this information, answer the questions below.

Question Parts

( a )

Correct the measured intensities for the detector sensitivity and determine the relative abundance (as a fraction) of each isotope.

( b )

Using the abundances obtained in (a), calculate the average atomic mass of chlorine (in atomic mass units, u).

( c )

The accepted standard atomic mass of chlorine is 35.45 u. Calculate the percentage error of the experimental value obtained in (b).

( d )

Suggest two possible sources of error that could have contributed to the discrepancy between the experimental and standard atomic masses.

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This is Waec Model Questions Vol1 2019 Chemistry Question 1. It is a practical question from the 2019 Waec Model Questions Vol1 Chemistry examination.

The question covers Atomic Structure .

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