Why is the data for water different from the elements, hydrogen and oxygen?

What is the molality of a solution that has 4 mol of kci in 0.800 kg of water

When balancing a chemical equation:

Which are examples of how technology has advanced scientific understanding.1using hot water to sterilize medical equipment.2transplanting a human organ into another individual.3inserting genes from one sheep into another cell to make a cloneunderstanding the different structures that make up a cell.4examining microorganisms from the deepest parts of the ocean