What is the percent composition of silicon in silicon carbide (sic)? a. 28% b. 50% c. 70% d. 142%

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Question :- What is the percent composition of silicon in silicon carbide (SiC)?

A. 28%

B. 50%

C. 70%

D. 142%

Answer :- The percentage of silicon content in silicon carbide (SiC) is option (C) 70%.

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Answer : The correct option is, (C) 70%

Explanation : Given,

Molar mass of Si = 28.09 g/mole

Molar mass of C = 12 g/mole

Molecular mass of SiC = 28.09 + 12 = 40.09 g/mole

To calculate the mass percent of an element in a compound, we use the equation:

Now put all the given values in above equation, we get:

Hence, the percentage composition of Si in the given compound is 70%

  the   balanced   equation   for   reaction of   ca metal   with   o2 to   produce   cao   is as below

2 ca+ o2→ 2 cao2

  explanation

the reaction is   balanced     since the   number of atoms   in reactant side is   equal to   number of atoms   in   product side.   for   example   they   are 2   atom of   ca in   reactant   side   and   2   atoms of ca   in   the product side.

  the   process   is a   meet the   requirement   of   redox   reaction because :     calcium   is   oxidized   from   oxidation state 0   to 2+   while   oxygen   is reduced from   oxidation   state   0   to 2-