Question

plsss answer all plsss​

Answer 1

Answer:

$Na2CO3. 10 H2O$

$= 2×Na+1×C+3×O+20×H+10×O$

$= 2× 23 + 1× 12 + 3× 16 + 20×1+10×16$

$=46+12+48+20+160$

$=286$

The answer is 286 option 2

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