Determine the pH of a 0.21-M NaF salt solution at 25 °C. The Ka of HF is 3.5×10-5. Enter your pH to the nearest 0.01.

Find the number of grams of hcl needed to react completely with .50 moles of magnesium.

An atom with 7 protons, 6 neutrons, and 7 electrons has an atomic mass of amu. (enter a whole number.) numerical answers expected! answer for blank 1:

The solid xy decomposes into gaseous x and y: xy(s) m x(g) + y(g) kp = 4.1 (at 0 °c) if the reaction is carried out in a 22.4 l container, which initial amounts of x and y will result in the formation of solid xy?