Which of the following measurements contain exactly three significant figures? — Mole Concept and Some Basic Concepts of Chemistry Chemistry Question

💡 Solution & Explanation

In A ($0.00450$), leading zeros are ignored, the trailing zero after the decimal is significant, giving 3 sig figs. In B ($5.04$), trapped zeros are significant, giving 3. In C ($1.00 \times 10^4$), the exponential part is ignored, and the coefficient has 3 sig figs. In D ($0.050$), only the 5 and trailing zero are significant, giving 2 sig figs.