-
A compound is 40.0% carbon, 6.67% hydrogen, and 53.33% oxygen by mass. What is its empirical formula?
- a) C₂H₄O
- b) CHO
- c) C₂H₂O₂
- d) CH₂O ✓ (correct answer)
-
A compound has the empirical formula CH₂O and a relative molecular mass of 180. What is its molecular formula? (C = 12, H = 1, O = 16)
- a) C₅H₁₀O₅
- b) C₃H₆O₃
- c) C₆H₁₂O₆ ✓ (correct answer)
- d) C₆H₆O₆
-
A gas occupies 600 cm³ at 800 mmHg. What volume will it occupy at 1200 mmHg if its temperature remains constant?
- a) 900 cm³
- b) 300 cm³
- c) 400 cm³ ✓ (correct answer)
- d) 800 cm³
-
A gas occupies 500 cm³ at 100 kPa. If it is compressed to 250 cm³ at constant temperature, what is its new pressure?
- a) 200 kPa ✓ (correct answer)
- b) 500 kPa
- c) 50 kPa
- d) 250 kPa
-
A fixed mass of gas occupies 250 cm³ at 27°C. What volume will it occupy at 127°C if pressure stays constant? Use Kelvin temperatures.
- a) 300 cm³
- b) 333 cm³ ✓ (correct answer)
- c) 200 cm³
- d) 425 cm³
-
A gas occupies 300 cm³ at 300 K. At constant pressure, what volume will it occupy at 450 K?
- a) 300 cm³
- b) 200 cm³
- c) 450 cm³ ✓ (correct answer)
- d) 600 cm³
-
Which equation relates pressure and volume for a fixed amount of gas at constant temperature?
- a) P₁V₁/T₁ = P₂V₂/T₂
- b) V₁/T₁ = V₂/T₂
- c) P₁V₁ = P₂V₂ ✓ (correct answer)
- d) P₁/T₁ = P₂/T₂
-
A gas occupies 400 cm³ at 750 mmHg and 27°C. What volume will it occupy at 900 mmHg and 127°C? Use Kelvin temperatures.
- a) 333 cm³
- b) 444 cm³ ✓ (correct answer)
- c) 533 cm³
- d) 400 cm³
-
A gas changes from 2.0 L at 100 kPa and 300 K to 1.5 L at 360 K. What is its final pressure?
- a) 160 kPa ✓ (correct answer)
- b) 150 kPa
- c) 240 kPa
- d) 120 kPa
-
A gas occupies 2.0 L at 100 kPa and 300 K. It changes to 1.5 L at 120 kPa. What is its final temperature?
- a) 360 K
- b) 300 K
- c) 180 K
- d) 270 K ✓ (correct answer)