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Chemistry · Some Basic Concepts of Chemistry

हिन्दी

Referring to the molecular models shown, which statement accurately accounts for the mass ratio of constituent elements in a single molecule of water (\( \text{H}_2\text{O} \)) versus a single molecule of carbon dioxide (\( \text{CO}_2 \))? Which of the above statements is/are correct?

  1. Water has an \( \text{H}:\text{O} \) mass ratio of \( 1:8 \), while carbon dioxide has a \( \text{C}:\text{O} \) mass ratio of \( 3:8 \).
  2. Water has an \( \text{H}:\text{O} \) mass ratio of \( 1:16 \), while carbon dioxide has a \( \text{C}:\text{O} \) mass ratio of \( 3:4 \).
  3. Water has an \( \text{H}:\text{O} \) mass ratio of \( 2:1 \), while carbon dioxide has a \( \text{C}:\text{O} \) mass ratio of \( 1:2 \).
  4. Water has an \( \text{H}:\text{O} \) mass ratio of \( 1:4 \), while carbon dioxide has a \( \text{C}:\text{O} \) mass ratio of \( 3:16 \).

Correct answer · Option 1

Water has an \( \text{H}:\text{O} \) mass ratio of \( 1:8 \), while carbon dioxide has a \( \text{C}:\text{O} \) mass ratio of \( 3:8 \).

Explanation

In \( \text{H}_2\text{O} \), mass ratio of \( \text{H}:\text{O} = (2 \times 1) : 16 = 2:16 = 1:8 \). In \( \text{CO}_2 \), mass ratio of \( \text{C}:\text{O} = 12 : (2 \times 16) = 12:32 = 3:8 \).
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