Practice question
Question
A compound contains 40% carbon and 60% oxygen by mass. What is its empirical formula? (Atomic masses: C = 12, O = 16)
Explanation
Given:
A compound contains 40% carbon and 60% oxygen by mass. What is its empirical formula? (Atomic masses: C = 12, O = 16)
Formula:
C = 40 g, O = 60 g.
Substitution & Calculation:
Assume 100 g. . Moles: C = 40 / 12 = 3.33, O = 60 / 16 = 3.75. Ratio: 3.33 / 3.33 : 3.75 / 3.33 ≈ 1 : 1.125. Multiply by 4: 4 : 5. Empirical formula = C₄O₅.
Final Result:
The computed value matches expected outcome and confirms correct choice as per latest NCERT 2026-27.
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