Match the compound to its respective mass ratio by elements from the table given below.Compound Mass Ratio by Elements 1. Water (H2O) A. 1 : 8 2. Carbon dioxide (CO2) B. 14 : 3 3. Ammonia (NH3) C. 3 : 8 4. Sulphur dioxide (SO2) D. 1 : 1
1 → A, 2 → C, 3 → B, 4 → D
The mass ratio of elements in a compound is obtained from the atomic masses multiplied by the number of atoms of each element in the formula unit.
Water (H2O): H : O = (2 × 1) : (1 × 16) = 2 : 16 = 1 : 8 → A.
Carbon dioxide (CO2): C : O = 12 : (2 × 16) = 12 : 32 = 3 : 8 → C.
Ammonia (NH3): N : H = 14 : (3 × 1) = 14 : 3 → B.
Sulphur dioxide (SO2): S : O = 32 : (2 × 16) = 32 : 32 = 1 : 1 → D.
Hence, the correct matching is 1 → A, 2 → C, 3 → B, 4 → D.
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Important Questions from Basic Concepts of Chemistry
- Which law states that a compound always contains the same elements in the same proportion by mass?
- Which of the following is NOT applicable to the Law of Constant Proportion?
- Which of the following best differentiates a mixture from a compound?
- Which of the following is an element?
- Which of the following best defines a heterogeneous mixture?
