In the mass spectrum of 2,6-dimethyl-4-heptanol, there are prominent peaks at . Propose reasonable structures for these fragment ions.

A sulphuric acid solution containing per liter of the solution has a density of . (Note:  ; ). Calculate the molarity.

Nitrogen dioxide reacts with water to form nitric acid and nitrogen monoxide according to the equation:
3NO2(g)+H2O(l)→2HNO3(l)+NO(g)

Suppose that 4.5 mol NO2NO2 and 0.40 mol H2OH2O combine and react completely. Which reactant is in excess?

Give the IUPAC name for each of the following

A 0.16 mol dm−3 solution (3.50 cm3) of s-butyllithium in toluene was
added to a solution of styrene (8.40 g) in toluene (200 cm3). After
complete conversion of the styrene, isoprene (28.00 g) was added.
When the isoprene had completely polymerized, the reaction was
completed by addition
of a 0.10 mol cm-3 solution (2.80 cm3) of dichloromethane in toluene.
(a) Write down the reactions occurring in each stage of this reaction
sequence and show the structure of the final polymer. (b) Evaluate the
relevant degrees of polymerization and the corresponding molar masses
for the final polymer.

1. What is the percentage of water in NiCl2.6H2O.