<u>Hydrogen bonds </u>are weak bonds that are not strong enough to hold atoms together to form molecules but are strong enough to form bonds within and around large molecules.
- The hydrogen bond is weak bond.
- The hydrogen bond is electrostatic force of attraction between hydrogen atom and more electronegative atoms or group ( like Florine , oxygen or nitrogen) which is contently bonded.
- The hydrogen bond is occur in polar , contently bond atoms in different molecules.
- Example is H-O-H or

- The positively charged hydrogen side of one water molecule is bond with negatively charged oxygen side of another molecule.
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Silicon, it's bring brother would be the prime candidate, although its compounds are notably different from those of carbon.
Answer:
So, 10 mole of water will weigh (18x10) = 180g.
Ethanol will evaporate first because it is more volatile or has a lower boiling point than water.
We all know, Density = Mass/ volume.
When volume increases and the mass remains the same , the density will decrease considerably.