Neco Model Questions Vol1 2025 Chemistry Question 4

Practice practical question 4 from the 2025 Neco Model Questions Vol1 Chemistry examination. This question covers Mole Concept .

Neco Model Questions Vol1 2025 Chemistry Practical

Topic: Mole Concept

Question 4 NECO_MODEL_QUESTIONS_VOL1 • 2025 • CHEMISTRY • practical

A 0.500 g sample of an unknown metal is placed in excess dilute hydrochloric acid in a gas‑collection‑over‑water apparatus. The volume of gas collected is 112.0 mL at 25 °C and a barometric pressure of 760 mmHg. The vapour pressure of water at 25 °C is 23.8 mmHg. The gas is identified as hydrogen. Using the data supplied, answer the following questions.

Question Parts

( a )

Calculate the number of moles of hydrogen gas collected, correcting for the water vapour pressure.

( b )

Assuming the reaction proceeds according to M + 2HCl → MCl₂ + H₂, determine the number of moles of metal that have reacted.

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About This Question

This is Neco Model Questions Vol1 2025 Chemistry Question 4. It is one of the practical questions from the 2025 Neco Model Questions Vol1 Chemistry examination.

The question covers Mole Concept .

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