1.

Find the formula mass of CaSO4, if atomic mass of Ca = 40.1 u, S = 32.1 u and O = 16.0 u.

Answer»

Formula mass of CaSO4

= Average atomic mass of Ca + Average atomic mass of S + Average atomic mass of four O

= (40.1) + 32.1 + (4 × 16.0) 

= 136.2 u

∴ Formula mass of CaSO4 = 136.2 u



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