Firstly set it out in ratio form, there's nothing new here just what we know already
1.86 C : 0.39 H : 2.75 Cl
From here we want to get the atomic mass of the element and divide it into said element, eg; 1.86 divided by 12.01 = 0.15 (2dp)
0.15 : 0.39 : 0.08
(These are the answers I got with...