I need help on my chemistry quiz

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

Under normal conditions, describe how increasing the temperatures effects the solubility of a typical salt

‘which reaction would most likely require the use of an inert electrode?