Neco 2018 Chemistry Question 4

Practice practical question 4 from the 2018 Neco Chemistry examination. This question covers Mole Concept .

Neco 2018 Chemistry Practical

Topic: Mole Concept

Question 4 NECO • 2018 • CHEMISTRY • practical

A 0.500 g sample of an unknown metal carbonate (MCO₃) is placed in a clean, dry crucible. The crucible is heated strongly until no further change in mass occurs and a solid residue remains. The gaseous product is collected over water. The volume of gas measured at 25 °C and 760 mmHg is 112.0 mL. The vapour pressure of water at 25 °C is 23.8 mmHg. Assume the gas collected is carbon dioxide released by the decomposition reaction: \[\text{MCO}_{3(s)} \rightarrow \text{MO_{(s)}} + \text{CO}_{2(g)}\] Answer the following:

( a )

Calculate the number of moles of CO₂ collected (dry gas). Show all working and state any assumptions.

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

The question covers Mole Concept .

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