PLEASE I REALLY NEED HELP Using the following equations, calculate the H of the reaction in which solid sulfur and water vapor combine to form sulfur dioxide (SO2) gas and dihydrogen sulfide (H2S). Show all steps of your work.
H2(g) +S(s) H2S (g) H = -19.9kJ
SO2 (g) → S(s) + O2 (g) H = +297.01 kJ
H2 (g) + 2 O2 (g) → H2O (g) Η = -286.3 kJ ​

Which statements describe polyatomic ions? check all that apply. polyatomic ions have many charges. polyatomic ions have one overall charge. polyatomic ions repel other ions to form ionic bonds. polyatomic ions attract other ions to form ionic bonds. polyatomic ions are made up of only one type of atom. polyatomic ions are made up of two or more types of atoms.

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

The number to the right of an element's symbol (ex. c-12) identifies the of an isotope.