Neco 2018 Chemistry Question 2

Practice practical question 2 from the 2018 Neco Chemistry examination. This question covers Periodic Table .

Neco 2018 Chemistry Practical

Topic: Periodic Table

Question 2 NECO • 2018 • CHEMISTRY • practical

A 0.250 g sample of an unknown metal M was placed in a conical flask and reacted with excess dilute hydrochloric acid according to the equation: M + 2HCl → MCl₂ + H₂(g) The experiment was carried out at 25 °C and atmospheric pressure of 760 mmHg. The volume of hydrogen gas collected over water was 112.0 mL. The vapour pressure of water at 25 °C is 23.8 mmHg. Using the data above, answer the following questions:

( a )

Calculate the number of moles of dry hydrogen gas collected.

( b )

Determine the molar mass of the metal M.

( c )

Identify the metal by comparing the calculated molar mass with values in the periodic table (give the nearest whole‑number atomic mass).

( d )

State two experimental precautions that should be observed to improve the accuracy of the molar‑mass determination.

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This is Neco 2018 Chemistry Question 2. It is one of the practical questions from the 2018 Neco Chemistry examination.

The question covers Periodic Table .

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