In the chemical reaction, Mg + 2 HCI → MgCl2 + H2 how many moles of HCl are needed to completely react with 1 mole of Mg

Calculate the molar mass of aluminum oxide (al2o3). express your answer to four significant figures.

Freezing and boiling are endothermic processes. this means that these processes absorb energy from their surroundings in order to occur. use this information and the data you collected in the phase change gizmo to describe what happens to the temperature of water when you boil it, then explain why this result occurs.

Acompound has a molecular weight of 12.124 atomic mass units and the empirical formula c3h40. what is the molecular formula of the compound?