Which colour does litmus paper turn with acid

In numbering carbon atoms in the parent chain of a hydrocarbon, why would you number from right to left, rather than left to right

The conventional equilibrium constant expression (kc) for the system below is: 2icl(s) ⇄ i2(s) + cl2(g) [cl2] ([i2] + [cl2])/2[icl] [i2][cl2]/[icl]2 none of the listed answers are correct [i2][cl2]/2[icl]

What substance has a mass of 9.5g and volume of 2.1cm^3