What is KUFCA? in science?

What is the number of moles in 15.0 g ash3?

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

Consider the four elements above. which one of these elements will combine with oxygen in a 1: 1 ratio?