Question

Which of the following has highest mass ?

• A. One molecule H₂O
• B. One gram H₂O
• C. One ml H₂O
• D. One mole H₂O

Answer 1

The Correct Option is D

To solve this question, we need to determine which option corresponds to the highest mass of water (H₂O).

1. One Mole of H₂O:
A mole of any substance contains \( 6.022 \times 10^{23} \) particles (Avogadro's number). The molar mass of water (H₂O) is 18 grams per mole. Therefore, one mole of water has a mass of 18 grams.

2. Evaluating Other Options:

• (A) One molecule of H₂O – The mass of a single molecule is very tiny, approximately \( 3 \times 10^{-23} \) grams, which is extremely small.
• (B) One gram of H₂O – This corresponds to a mass of 1 gram, which is less than a mole of H₂O.
• (C) One ml of H₂O – One ml of water weighs approximately 1 gram, which is still much less than a mole of water.
• (D) One mole of H₂O – Correct; one mole of H₂O has the highest mass (18 grams).

Final Answer:
The correct answer is (D) One mole H₂O.