A compound is found to contain 26.96 % sulfur, 13.45 % oxygen, and 59.59 % chlorine by mass.

If the compound is 100g

then 25.96g sulfur, 13.45g oxyegn and 59.59g chlorine.

sulfur: 25.96g/32.065g/mole=0.809moles

oxygen: 13.45g/16.0g/mole=0.84moles

chlorine: 59.59g/35.45g/mole=1.63moles

1.63:0.81:0.84

is almost

2:1:1

therefore, we can say it is

SOCl2