Question

calculate the formula mass of (a) (na2co3.10h2o).h2co3
ans in no
and appropriate​

Answer 1

Answer:

Correct option is B)

Formula unit mass of Na

2

CO

3

= 2×atomic mass of Na+1×atomic mass of C+3×atomic mass of O

=2×22.98+1×12.01+3×16

=105.97u

Formula unit mass of 10H

2

O=10×atomic mass of H

2

O

=10×18.02

=180.02u

Formula unit mass of Na

2

CO

3

.10H

2

O=105.97+180.02

=285.99u