Q1 · medium · AI-verified
How many moles of CO₂ are produced when 44 g of CO₂ is collected? (C = 12, O = 16)
- 44 moles
- 0.5 moles
- 1 mole
- 2 moles
Q2 · medium · AI-verified
In a covalent bond, a triple bond consists of how many sigma (σ) and pi (π) bonds?
- 1 sigma and 2 pi bonds
- 1 sigma and 1 pi bond
- 3 sigma and 0 pi bonds
- 2 sigma and 1 pi bond
Q3 · medium · AI-verified
The empirical formula of a compound is CH₂O and its molar mass is 180 g/mol. What is its molecular formula? (C=12, H=1, O=16)
- CH₂O
- C₂H₄O₂
- C₃H₆O₃
- C₆H₁₂O₆
Q4 · medium · AI-verified
Which of the following correctly describes the electronegativity trend across a period in the periodic table?
- Increases and then decreases across a period
- Remains constant across a period
- Decreases from left to right across a period
- Increases from left to right across a period
Q5 · medium · AI-verified
In the reaction: 2KClO₃ → 2KCl + 3O₂, how many grams of O₂ are produced when 24.5 g of KClO₃ (molar mass = 122.5 g/mol) completely decomposes?
- 4.8 g
- 19.2 g
- 14.4 g
- 9.6 g