Question

plzzzz yaar koi correct answer bta do ​

Answer 1

Answer:

286

Explanation:

Given,

$Na_{2}CO_{3}•10H_{2}O$

we know,

mass of following;

1)Na=23u

2)C=12u

3)O=16u

4)H=1u

then,formula unit mass

=(2×23)+(12)+(16×3)+(20×1)+(10×16)

=46+12+48+20+160

=286u

HOPE IT HELPED!!