Iodine monochloride, ICl, a black crystalline solid with an mp of 27.2°C and a bp of 97°C, is prepared by mixing equimolar amounts of I2 and Cl2. ICl is used to iodinate aromatic rings via an electrophilic aromatic substitution reaction. Draw the structure(s) of the most stable intermediate in the reaction when 3-aminobenzoic acid is iodinated at the position labeled as "a".

Agas mixture with a total pressure of 745 mmhg contains each of the following gases at the indicated partial pressures: co2, 245 mmhg ; ar, 119 mmhg ; and o2, 163 mmhg . the mixture also contains helium gas. part a what is the partial pressure of the helium gas? phe p h e = nothing mmhg request answer part b what mass of helium gas is present in a 10.2-l sample of this mixture at 283 k ? m m = nothing g request answer

Zoe is investigating the composition of substance a, an unknown substance. using chemical processes, she analyzes substance a and determines it is composed of sodium, oxygen, and hydrogen atoms in a ratio of 1 : 1 : 1. what is substance a? a. a compound b. an element c. a heterogeneous mixture d. a homogeneous mixture

Significant figures are digits read directly from the measuring instrument plus one more digit, which is __ by the observer.