Question

Which substance has the highest density at room temperature?

A.) Hydrogen
B.) Oxygen
C.) Water
D.) They are all the same

Answer 1

The answer is letter C.) Water

Water has an approximate density of 1g/cm^3 while Hydrogen and Oxygen have significantly smaller densities.

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Answer 2

The correct answer is C.Water

Water is the most dense compound of all the mentioned ones. Hydrogen and Oxygen are gasses.