select the correct answer. what is the percent composition of silicon in silicon carbide (sic)?\na. 28%\nb…

select the correct answer. what is the percent composition of silicon in silicon carbide (sic)?\na. 28%\nb. 50%\nc. 70%\nd. 142%

select the correct answer. what is the percent composition of silicon in silicon carbide (sic)?\na. 28%\nb. 50%\nc. 70%\nd. 142%

Answer

Explanation:

Step1: Find atomic masses

Atomic mass of Si (from periodic - table) is approximately 28 g/mol, atomic mass of C is approximately 12 g/mol.

Step2: Calculate molar mass of SiC

Molar mass of SiC = Atomic mass of Si+Atomic mass of C = 28 + 12=40 g/mol.

Step3: Calculate percent composition of Si

Percent composition of Si=$\frac{\text{Atomic mass of Si}}{\text{Molar mass of SiC}}\times100%=\frac{28}{40}\times100% = 70%$.

Answer:

C. 70%