Given the following enthalpies of formation calculate the change in enthalpy for the reaction. Then justify if the reaction is endothermic or exothermic based on your calculations. PLEASE HELP WILL GIVE BRAINLIEST

Start an single atom tab. observe the decay of polonium-211. after each decay, press the reset nucleus button to watch the process again. write a description of alpha decay for po-211

What must happen before a body cell can begin mitotic cell division

Which formula can be used to calculate the molar mass of ammonia (nh3)? molar mass of n + molar mass of h 3 × molar mass of n + molar mass of h molar mass of n + 3 × molar mass of h 3 × molar mass of n + 3 × molar mass of h