Igcse Model Questions Vol1 2024 Chemistry Question 5

Practice essay / theory question 5 from the 2024 Igcse Model Questions Vol1 Chemistry examination. This question covers Stoichiometry, Moles, Mass‑mass calculations, Percent yield .

Igcse Model Questions Vol1 2024 Chemistry Essay / Theory

Topics: Stoichiometry Moles Mass‑mass calculations Percent yield

Question 5 IGCSE_MODEL_QUESTIONS_VOL1 • 2024 • CHEMISTRY • essay

Magnesium metal reacts with excess hydrochloric acid according to the balanced equation: Mg + 2 HCl → MgCl₂ + H₂(g) A student collects 11.2 L of hydrogen gas at STP over water. The gas is dried and the volume measured again, still 11.2 L. The student then isolates the solid product and obtains 45.0 g of MgCl₂. Answer the following:

Question Parts

( a )

Calculate the number of moles of hydrogen gas collected.

( b )

From the amount of hydrogen obtained, determine the mass of magnesium that must have reacted.

( c )

Calculate the theoretical mass of MgCl₂ that should be formed from the magnesium calculated in part (b).

( d )

The actual mass of MgCl₂ obtained is 45.0 g. Determine the percent yield of the reaction.

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About This Question

This is Igcse Model Questions Vol1 2024 Chemistry Question 5. It is one of the essay questions from the 2024 Igcse Model Questions Vol1 Chemistry examination.

The question covers Stoichiometry, Moles, Mass‑mass calculations, Percent yield .

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