The double-replacement reaction between silver nitrate and sodium bromide produces silver bromide, a component of photographic film. (a) If 7.50 mol of silver nitrate react, what mass of sodium bromide is required? WebAssign will check your answer for the correct number of significant figures. (b) What mass of silver bromide is formed?

Elements in group 2 are all called alkaline earth metals. what is most similar about the alkaline earth metals?

)benzene and toluene form nearly ideal solutions. consider an equimolar solution of benzene and toluene. at 20 °c the vapour pressures of pure benzene and toluene are 9.9 kpa and 2.9 kpa, respectively. the solution is boiled by reducing the external pressure below the vapour pressure. calculate (i) the pressure when boiling begins, (ii) the composition of each component in the vapour, and (iii) the vapour pressure when only a few drops of liquid remain. assume that the rate of vaporization is low enough for the temperature to remain constant at 20 °c.

How many neutrons does an element have if its atomic number is 50 and its mass number is 166