What is the mass of 10 moles of sodium sulphite `(Na_2SO_3)`?

What is the mass of 0.2 mole of oxygen atoms?

What is the mass of 1 mole of nitrogen atoms?

What is the mass of 0.5 mole of water molecules?

What is the mass of one "^14CO_2 molecule?

What is the shape of SO_3 molecule?

What is the mass of 4 moles a aluminium atoms (Atomic mass of aluminium = 27)?

The unit of length convenient on the nuclear scale is a fermi : 1 f = 10^(-15) m. Nuclear sizes obey roughly the following empirical relation : r = r_0A^(1/3) where r is the radius of the nucleus, A its mass number, and r_0 is a constant equal to about, 1.2 f. Show that the rule implies that nuclear mass density is nearly constant for different nuclei. Estimate the mass density of sodium nucleus. Compare it with the average mass density of a sodium atom obtained in Exercise. 2.27.