Neco 2025 Chemistry Question 4

Practice practical question 4 from the 2025 Neco Chemistry examination. This question covers Mole Concept .

Neco 2025 Chemistry Practical

Topic: Mole Concept

Question 4 NECO • 2025 • CHEMISTRY • practical

A 5.00 g sample of a solid suspected to be calcium carbonate (CaCO₃) is reacted with excess hydrochloric acid. The carbon dioxide gas produced is collected over water at 25 °C. The volume of gas collected is 0.845 L. Atmospheric pressure is 760 mmHg and the vapour pressure of water at 25 °C is 23.8 mmHg. Using this data, determine the amount of CaCO₃ present in the sample and evaluate its percent purity.

( a )

Write the balanced chemical equation for the reaction between calcium carbonate and hydrochloric acid.

( b )

Calculate the number of moles of dry CO₂ gas collected, correcting for the water vapour pressure. Use R = 0.0821 L·atm·mol⁻¹·K⁻¹.

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This is Neco 2025 Chemistry Question 4. It is one of the practical questions from the 2025 Neco Chemistry examination.

The question covers Mole Concept .

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