In the lewis dot structure for nh3, the central atom of the molecule has three atoms bonded to it and one lone pair of electrons. mc006-1.jpg the shape of an nh3 molecule is

in chemistry, a solution’s concentration is how much of a dissolvable substance, known as a solute, is mixed with another substance, called the solvent. the standard formula is c = m/v, where c is the concentration, m is the mass of the solute dissolved, and v is the total volume

its first and third is your answer i did the qustion the fourth isnt right