Answer
Please see the work below.
Work Step by Step
We can calculate the molar mass of the given substances as:
a. $Li_2CO_3$
$2\times 6.941+12.011+3\times 15.9994=73.89$
b. $CS_2$
$12.011+2\times 32.06=76.13$
c. $CHCl_3$
$12.011+1+3\times 35.5=119.38$
d. $C_6H_8O_6$
$6\times 12.011+8\times 1+16\times 6=176.13$
e. $KNO_3$
$39+14+3\times 16=101.10$
f. $Mg_3N_2$
$3\times 24+2\times 14=100$
