What volume of NH3 is needed to react completely with 7.0 grams of H2?

Based on the equation and the information in the table, what is the enthalpy of the reaction?

What is the number of moles of chemical units represented by 9.03x10^24? and how do i show work? (dumb it down )

Which statement correctly describes the phosphate ion, ? it is composed of one phosphorus atom and four oxygen atoms covalently bonded together, and there is a –3 charge distributed over the entire ion. it is composed of one phosphorus atom and four oxygen atoms covalently bonded together, and there is a –3 charge on the phosphorus atom. it is composed of one phosphorus atom and four oxygen atoms ionically bonded together, and there is a –3 charge distributed over the entire ion. it is composed of one phosphorus atom and four oxygen atoms ionically bonded together, and there is a –3 charge on the phosphorus atom.