Why is the mass in amu of a carbon 12 reported as 12.011

How many moles is 14.5 cm^3 of platinum? the density of platinum is 21.45 g/cm^3.

Aconcentrated solution of ammonia is 14.8m and has a density of 0.899g/l. what is the concentration of ammonia in this solution in weight percent (%w/w)?

Which of the following nuclei would be the least stable a 2 protons, 2 neutrons b 1 proton 1 neutron c 1 proton 3 neutrons d 1 proton 2 neutrons