Ijmb Model Questions Vol1 2017 Chemistry Question 1

Practice practical question 1 from the 2017 Ijmb Model Questions Vol1 Chemistry examination. This question covers Atomic Structure, Spectroscopy .

Ijmb Model Questions Vol1 2017 Chemistry Practical

Topics: Atomic Structure Spectroscopy

Question 1 IJMB_MODEL_QUESTIONS_VOL1 • 2017 • CHEMISTRY • practical

A hydrogen discharge tube is connected to a simple spectroscope whose scale reads 0.1° per 5 nm of wavelength. The following angles were recorded for three visible lines of the hydrogen spectrum: - Line 1: 13.12° - Line 2: 10.50° - Line 3: 9.00° Using the Balmer formula 1/λ = R (1/2² – 1/n²) where n = 3, 4 and 5 respectively, determine the Rydberg constant (R) from the experimental data.

Question Parts

( a )

Convert each measured angle into the corresponding wavelength in nanometres.

( b )

For each wavelength calculate the value of the Rydberg constant using the Balmer relation. (Take n = 3 for line 1, n = 4 for line 2 and n = 5 for line 3.)

( c )

Calculate the average value of R from the three determinations.

( d )

Comment on the accuracy of the experimental Rydberg constant by comparing it with the accepted value 1.097×10⁷ m⁻¹.

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About This Question

This is Ijmb Model Questions Vol1 2017 Chemistry Question 1. It is one of the practical questions from the 2017 Ijmb Model Questions Vol1 Chemistry examination.

The question covers Atomic Structure, Spectroscopy .

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