Neco Model Questions Vol1 2018 Chemistry Question 4

Practice practical question 4 from the 2018 Neco Model Questions Vol1 Chemistry examination. This question covers Mole Concept, Gas Collection, Stoichiometry .

Neco Model Questions Vol1 2018 Chemistry Practical

Topics: Mole Concept Gas Collection Stoichiometry

Question 4 NECO_MODEL_QUESTIONS_VOL1 • 2018 • CHEMISTRY • practical

An unknown metal is to be identified by determining its molar mass using the reaction with dilute hydrochloric acid. The metal is reacted with excess HCl, the hydrogen gas evolved is collected over water and its volume measured. The data obtained are to be used to calculate the molar mass of the metal and to suggest its identity.

Question Parts

( a )

Write the balanced chemical equation for the reaction between the metal (M) and hydrochloric acid.

( b )

Outline the experimental set‑up and the steps required to collect the hydrogen gas over water and to obtain the necessary data for calculations.

( c )

The mass of the metal used was 0.500 g. The volume of hydrogen gas collected at 25 °C was 520 mL. Atmospheric pressure was 760 mmHg and the water‑vapour pressure at this temperature is 23.8 mmHg. Calculate the number of moles of hydrogen gas collected. (Use R = 0.0821 L·atm·mol⁻¹·K⁻¹)

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About This Question

This is Neco Model Questions Vol1 2018 Chemistry Question 4. It is one of the practical questions from the 2018 Neco Model Questions Vol1 Chemistry examination.

The question covers Mole Concept, Gas Collection, Stoichiometry .

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