Neco Model Questions Vol1 2021 Chemistry Question 22

Practice objective / multiple choice question 22 from the 2021 Neco Model Questions Vol1 Chemistry examination.

Neco Model Questions Vol1 2021 Chemistry Objective / Multiple Choice Hard Difficulty
Question 22 NECO_MODEL_QUESTIONS_VOL1 • 2021 • CHEMISTRY • objective

A \(0.80\ \text{g}\) sample of an unknown hydrocarbon is combusted completely in excess \( \mathrm{O_2} \), producing \(1.76\ \text{g}\) of \( \mathrm{CO_2} \) and \(0.81\ \text{g}\) of \( \mathrm{H_2O} \). (a) Determine the empirical formula of the hydrocarbon. (b) Assuming the hydrocarbon is an alkane (\( \mathrm{C_nH_{2n+2}} \)), find its molecular formula and molar mass. (c) Write the balanced combustion equation and calculate the number of moles of \( \mathrm{O_2} \) consumed.

Answer Options

A. Empirical formula C3H8; molecular formula C6H14; molar mass 86.2 g mol⁻¹; O2 consumed 0.075 mol
B. Empirical formula C5H11; molecular formula C10H22; molar mass 142.3 g mol⁻¹; O2 consumed 0.095 mol
C. Empirical formula C2H5; molecular formula C4H10; molar mass 58.1 g mol⁻¹; O2 consumed 0.060 mol
Correct Answer D. Empirical formula C4H9; molecular formula C8H18; molar mass 114.2 g mol⁻¹; O2 consumed 0.088 mol
Correct Answer
D
Correct Option:
Empirical formula C4H9; molecular formula C8H18; molar mass 114.2 g mol⁻¹; O2 consumed 0.088 mol

About This Question

This is Neco Model Questions Vol1 2021 Chemistry Question 22. It is one of the objective questions from the 2021 Neco Model Questions Vol1 Chemistry examination.

Difficulty level: Hard .

View More Neco Model Questions Vol1 2021 Chemistry Questions More Neco Model Questions Vol1 Practice Questions Back to Questions

Master the Exam!

You've seen a preview, but there are thousands more questions plus AI tutor to break down complex solutions.

Unlock Full Access Available for Android & Windows
Chat with Support