Question

what is the molar mass of the compound, potassium chloride, kcl? k = 39.098 g/mol, cl = 35.45 g/mol
○ a 58.44
○ b 74.548
○ c 35.45
○ d 39.098

question 4 (1 point)
what is the molar mass of the compound, calcium sulfide, cas? ca = 40.078 g/mol, s = 35.45 g/mol
○ a 4.628
○ b 35.45
○ c 40.078
○ d 75.528

Explanation:

First Question (Molar Mass of KCl)

Step1: Recall molar mass formula

Molar mass of a compound is the sum of molar masses of its constituent atoms. For KCl, it has 1 K and 1 Cl.

Step2: Calculate molar mass

Molar mass of KCl = Molar mass of K + Molar mass of Cl = \( 39.098 + 35.45 \)
\( 39.098+35.45 = 74.548 \) g/mol

Step1: Recall molar mass formula

Molar mass of a compound is the sum of molar masses of its constituent atoms. For CaS, it has 1 Ca and 1 S.

Step2: Calculate molar mass

Molar mass of CaS = Molar mass of Ca + Molar mass of S = \( 40.078 + 35.45 \)
\( 40.078 + 35.45=75.528 \) g/mol

Answer:

b. 74.548

Second Question (Molar Mass of CaS)