Question

Write the formula and calculate the formula unit masses of potassium carbonate ( atomic mass k = 39 , c = 12 , o =16 )

Answer 1

the chemical name of potassium carbonate equal to
$k \binom{}{2} co \binom{}{3}$
$39 \times 2 + 12 + 16 \times 3$
$78 + 12 + 48$
$138u$