Do you know you the difference between Mᵣ and Aᵣ?
Topic Overview - Calculations in Chemistry
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#1. Determine the molecular formula of hydrogen peroxide which has an empirical formula of HO. The Mᵣ for hydrogen peroxide is 34. Hydrogen Aᵣ - 1, Oxygen Aᵣ - 16.
#2. Calculate the empirical formula of a compound which contains 5.31g of chlorine (Aᵣ - 35.453) and 8.40g of oxygen (Aᵣ - 15.999).
#3. Which of the following descriptions matches the Aᵣ of an element?
#4. Which of the following descriptions matches the term molecular formula?
#5. Calculate the relative formula mass of copper oxide (CuO) to 2 decimal places. Copper Aᵣ = 63.5, Oxygen Aᵣ = 16.
#6. Determine the empirical formula for Cyanuric triazide - C₃N₁₂.
#7. Relative atomic mass used to have a different name. What was that name?
#8. Determine the empirical formula for Cyclopentane - C₅H₁₀?
#9. What is meant by the term empirical formula mass?
#10. Determine the molecular formula of glucose which has an empirical formula of CH₂O. The Mᵣ for glucose is 180. Carbon Aᵣ - 12, Hydrogen Aᵣ - 1, Oxygen Aᵣ - 16.
#11. Calculate the empirical formula of a compound that contains 69.94g of Fe (Aᵣ - 55.85) and 30.06g of O (Aᵣ - 12.00).
#12. Determine the empirical formula of glucose - C₆H₁₂O₆.
#13. What is the symbol for relative formula mass (also known as relative molecular mass)?
#14. Lead has 4 stable isotopes. ²⁰⁴Pb (abundance - 1.4%), ²⁰⁵Pb (abundance - 24.1%), ²⁰⁷Pb (abundance - 22.1%) and ²⁰⁸Pb (abundance - 52.4%). Calculate the Aᵣ of lead. Answer to 2 decimal places.
#15. Hydrogen has two stable isotopes, ¹H (abundance - 99.972%) and ²H (abundance - 0.001%). Calculate the Aᵣ of hydrogen. Answer to 3 decimal places.
#16. Calculate the relative formula mass of carbon monoxide (CO) to 2 decimal places. Carbon Aᵣ = 12, Oxygen Aᵣ = 16.
#17. Which of the following descriptions matches the term empirical formula?
#18. Which of the following descriptions matches the Mᵣ of a compound?
#19. Calculate the relative formula mass of water to 2 decimal places. Hydrogen Aᵣ = 1, Oxygen Aᵣ = 16.
#20. Chlorine has two stable isotopes, ³⁵Cl (75.77%) and ³⁷Cl (24.23%). Calculate the Aᵣ of chlorine to 2 decimal places.
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