PLEASE HELP ASAP Calculate the pH of a mixture of 50.0 cm^3 of 0.100 mol dm^–3
aqueous ammonia and 50.0 cm^3 of 0.0500 mol dm^–3 hydrochloric acid solution. Kb = 1.78 x 10^-5.

Calculate the number of kilojoules to warm 125 g of iron from 23.5°c to 78.0°c.

May someone me with these science questions

Select all of the statements which are true. electrons are located in shells or orbits around the atom. electrons orbit slowly around the atom. electrons travel in one flat path around the nucleus of an atom. the valence of an atom is determined by the number of electrons in the atom's outermost shell.