Can someone help me please

Write the symbol for every chemical element that has atomic number greater than 3 and atomic mass less than 12.0 u.

If 90.0 grams of ethane reacted with excess chlorine,how many grams of dicarbon hexachloride would form

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