Atomic mass of chromium, Cr = 52.0 Amount of Cr = 11.9/52.0 = 0.229mol There are 0.229 moles of chromium in a 11.9g pure chromium sample. read more
Use the equation. Given moles X Molar Mass(g)/ 1 mol= Mass in Grams.. so... 11.9 X 51.99616(g)/1mol. read more