A buffer solution contains 0.303 M C6H5NH3Cl and 0.424 M C6H5NH2 (aniline). Determine the pH change when 0.108 mol HClO4 is added to 1.00 L of the buffer. pH after addition − pH before addition = pH change =

answer; i believe that the correct answer is (a) potassium(k)

the atomic number will stay the same no matter how many electrons it has, so it doesn’t decrease nor increase. it’ll only change with a different number of protons

the density of gold = 19.3 g/cm3

the relation between density and mass and volume is

density = mass / volume

given :

mass of gold = 13 g

density = 13g / volume = 19.3

volume = 13 /19.3 = 0.67 cm^3

thus volume of gold nugget = 0.67 cm^3