Answer:
The molar mass of E = 15.96 g/mol
Step-by-step explanation:
Step 1: Data given
The compound Cr2E3 contains 68.47 % Cr and 31.53 % E
The molar mass of Cr = 52 g/mol
⇒ 2*52 = 104 g/mol
The molar mass of Cr2E3 = 2*52 g/mol + 3X
Step 2: Calculate mass of Cr2E3
Cr is 68.47 %
Mass of Cr = 104 grams
Cr2E3 is 100%
Mass of Cr2E3 = 151.89 grams
Molar mass of Cr2E3 = 151.89 g/mol
Step 3: Calculate mass of E
Mass of E3 = mass of Cr2E3 - mass of Cr
Mass of E3 = 151.89 grams - 104 grams
Mass of E3= 47.89 grams
Mass of E = 15.96 grams
The molar mass of E = 15.96 g/mol