hitungglah massa dari 10 mol K2 Cr2 O7 (Ar K = 39, Cr= 52, dan O = 16)

Mr K2Cr2O7 = ( 39 × 2 ) + ( 2 × 52 ) + ( 16 × 7 )
= 78 + 104 + 112 = 294

Massa = Mol × Mr = 10 × 294 = 2.940 gram.

Semoga membantu.