Question

Sodium carbonate (na2co3. 10.h2o) is an important industrial chemical. calculate its formula unit mass.

Answer 1

Atomic mass of Na = 23
Atomic mass of C = 14
Atomic mass of O2 = 16 &
Atomic mass of H2 = 1
Na2CO3.10H2O = 2×23+1×14+4×16+10×1
=46+14+64+10
=134 amu