Neco 2017 Chemistry Question 1

Practice practical question 1 from the 2017 Neco Chemistry examination. This question covers Atomic Structure, Molar Mass Determination .

Neco 2017 Chemistry Practical

Topics: Atomic Structure Molar Mass Determination

Question 1 NECO • 2017 • CHEMISTRY • practical

A student carries out an experiment to determine the molar mass of magnesium by reacting a weighed piece of magnesium ribbon with excess hydrochloric acid. The procedure is as follows: 1. A clean, dry magnesium ribbon is weighed and its mass recorded as 0.150 g. 2. The ribbon is placed in a conical flask containing excess 1.0 M HCl and the gas evolved is collected over water. 3. The volume of hydrogen gas collected is 156.0 mL at a temperature of 25 °C and an atmospheric pressure of 760 mmHg. 4. The vapour pressure of water at 25 °C is 23.8 mmHg. Assume the reaction: Mg + 2HCl → MgCl₂ + H₂ and that the gas behaves ideally. Answer the following:

( a )

Calculate the number of moles of hydrogen gas collected.

( b )

Determine the experimental molar mass of magnesium from the data.

( c )

Suggest two possible sources of error that could cause the experimental value to differ from the accepted molar mass of magnesium (24.31 g·mol⁻¹).

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This is Neco 2017 Chemistry Question 1. It is one of the practical questions from the 2017 Neco Chemistry examination.

The question covers Atomic Structure, Molar Mass Determination .

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