Question

The molecular mass of Na₂CO₃×10H₂O is: (1)286 u (2)180 u (3)106 u (4)272 u

Answer 1

Answer:

(1) 286u

Explanation:

atomic weights of atoms present in Na2CO3.10H2O are,

Na - 23u

C - 12u

O - 16u

H - 1u

add individual atomic mass,

(2*23)+12+(3*16)+(10*2*1)+(10*16)

= 286

so answer is option (1) 286u