Daily Super-Hard Tasks
Every day gives 3 super-hard tasks based on the book problem sets. Date key: 2026-03-11.
Today's Set
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[Eremin & Kuzmenko (2005), Problem 2-49] 100 L O₂ is mixed with 100 L CO and ignited. Find final total gas volume and final gas composition by volume after reaction completion.
Hint: Use 2CO + O₂ -> 2CO₂ and limiting-reactant logic in volume units.
[Berezan, Problem 1.44(d)] Find mass of a gas mixture at STP containing 200 cm³ CO₂ and 0.3 m³ N₂.
Hint: Convert mixed volume units first, then apply n = V / 22.4 and m = nM.
[Berezan, Problem 1.38] A mixture contains 2.5 kg CO₂ and 6.0 kg CH₄. Find total mixture volume at STP.
Hint: Convert each mass to moles separately, sum moles, then multiply by 22.4 L/mol.