Which of the following best represents the mass density of pure water at 4°C under standard atmospheric pressure?

• A. 1.00 g/cm^3
• B. 2.00 g/cm^3
• C. 0.80 g/cm^3
• D. 0.50 g/cm^3

Answer: (A)

Verified step by step guidance

1. Understand that mass density is defined as mass per unit volume, mathematically expressed as \(\rho = \frac{m}{V}\), where \(\rho\) is density, \(m\) is mass, and \(V\) is volume.
2. Recall that pure water has its maximum density at 4°C under standard atmospheric pressure, which is a well-known physical property.
3. Recognize that the commonly accepted density of pure water at 4°C is approximately 1.00 g/cm\(^{3}\), meaning 1 gram of water occupies 1 cubic centimeter of volume.
4. Compare the given options to this known value to identify which one best matches the standard density of water at 4°C.
5. Conclude that the value closest to 1.00 g/cm\(^{3}\) is the best representation of the mass density of pure water at 4°C under standard atmospheric pressure.