Question

Which has the highest percent mass of Cl?

C2Cl6

C2Cl4

CCl4

C2Cl2

Answer 1

letc calculate the mass percent of Cl in all compound

for C2Cl6:

Molar mass of C2Cl6 = 2*MM(C) + 6*MM(Cl)

= 2*12.01 + 6*35.45

= 236.72 g/mol

MM of C2Cl6 = 236.72

Lets calculate the mass of element

mass of Cl = 6*MM(Cl)

= 212.7 g

Mass % of Cl = (212.7*100)/236.72

= 89.853

for C2Cl4:

Molar mass of C2Cl4 = 2*MM(C) + 4*MM(Cl)

= 2*12.01 + 4*35.45

= 165.82 g/mol

MM of C2Cl4 = 165.82

Lets calculate the mass of element

mass of Cl = 4*MM(Cl)

= 141.8 g

Mass % of Cl = (141.8*100)/165.82

= 85.5144

for CCl4:

Molar mass of CCl4 = 1*MM(C) + 4*MM(Cl)

= 1*12.01 + 4*35.45

= 153.81 g/mol

MM of CCl4 = 153.81

Lets calculate the mass of element

mass of Cl = 4*MM(Cl)

= 141.8 g

Mass % of Cl = (141.8*100)/153.81

= 92.1917

for C2Cl2:

Molar mass of C2Cl2 = 2*MM(C) + 2*MM(Cl)

= 2*12.01 + 2*35.45

= 94.92 g/mol

MM of C2Cl2 = 94.92

Lets calculate the mass of element

mass of Cl = 2*MM(Cl)

= 70.9 g

Mass % of Cl = (70.9*100)/94.92

= 74.6945

Answer: CCl4