Question

Calculate the molar mass of the following substances :

Potassium Carbonate ($K_{2}CO_{3}$) K = 39u

Answer 1

Answer:

138 g/ mol

Explanation:

K2 = 39*2 = 78u

C = 12 u

O3 = 16*3= 48 u

Adding all we get 1 mole of potassium carbonate = 138 u

= 138 g/mol

Answer 2

Answer:

The molar mass of $K_{2}CO_{3}$  is $138$ g/mol

Explanation:

Molar mass (molecular mass):- A mole of any substance is $6.022*10^{23}$  molecule. So the mass of one atom of carbon-$12$ the atomic mass of carbon$-12$ is exactly $12$ atomic mass units.

(K)potassium its atomic mass is $39$ $g/mol$ and potassium has $2$ molecules ⇒ $39*2=78$ $g/mol$

Another carbon(C) molecule that presents in the compound is $12$ and it has only one carbon molecule ⇒$12*1=12$ $g/mol$

The compound has total oxygen(O) molecules is $3$ so the atomic weight of oxygen ⇒$16*3=48$ $g/mol$

Hence, adding all the molecule’s atomic weight $78+12+48=138$ $g/mol$

so the molar mass of $K_{2}CO_{3}$ is $138$ $g/mol.$