Neco 2025 Chemistry Question 1

Practice practical question 1 from the 2025 Neco Chemistry examination. This question covers Atomic Structure, Moles and molar mass, Gas laws .

Neco 2025 Chemistry Practical

Topics: Atomic Structure Moles and molar mass Gas laws

Question 1 NECO • 2025 • CHEMISTRY • practical

A student determines the molar mass of magnesium by reacting weighed pieces of the metal with excess hydrochloric acid and collecting the hydrogen gas over water. The experiment is carried out at 25 °C and the atmospheric pressure is 760 mmHg. The vapour pressure of water at this temperature is 23 mmHg. The data obtained are shown in the table below. | Trial | Mass of Mg (g) | Volume of H₂ collected (L) | |-------|----------------|----------------------------| | 1 | 0.500 | 0.550 | | 2 | 0.750 | 0.825 | | 3 | 1.000 | 1.100 | Using the data, answer the following:

( a )

Calculate the number of moles of H₂ collected in each trial.

( b )

Determine the experimental molar mass of magnesium for each trial.

( c )

Calculate the average experimental molar mass of magnesium from the three trials.

( d )

State two possible sources of error that could affect the result obtained.

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This is Neco 2025 Chemistry Question 1. It is one of the practical questions from the 2025 Neco Chemistry examination.

The question covers Atomic Structure, Moles and molar mass, Gas laws .

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