Organic Chemistry Answers

12 g of an alkyne are mixed with 11.2 L H, in STP in the presence of Ni and the mixture is heated. At the end of the reaction, a gaseous mixture of two hydrocarbons is formed which cannot react with Na. Half of the mixture of the two hydrocarbons can decolorize 250 mL of Br solution, 0.2 M in CCl solvent. Determine: a. the structural formula of hydrocarbon b. the qualitative and quantitative (in mol) composition of the gas mixture resulting from the hydrogenation reaction. Given Ar: C-12 H-1

Show that for one mole of a perfect gas, 𝑑𝑆𝑚 = 𝐶𝑃,𝑚

𝑑𝑇

𝑇

− 𝑅

𝑃

𝑑

If a 1.25 g sample zinc oxide, 95% ZnO, were treated with 50mL of 1.1230N sulfuric acid

in the usual way, what volume of 0.9765N sodium hydroxide would be required in the

back titration?

 If you were to start with 1.00 g of salicylic acid, what volume of acetic anhydride would be

needed to completely react with it? The density of acetic anhydride is 1.082 g/mL

Lithium aluminum hydride (LiAlH₄) readily reduces the C=O double bond of aldehydes and ketones to the corresponding alcohols whereas the reduction of alkenes is unfavorable. Briefly state the reason for the differential reactivity.

if 5% nacl solution use to regeneration of zeolite,it is capable to removing.....mg caco3 equivalent hardness per lit

80cm³ mixture of propane and hydrogen was mixed with excess oxygen and exploded. The product after cooling to the original room temperature were treated with excess potassium hydro oxide solution when the volume decrease by 60cm³. Calculate the composition of the original mixture

Alcohol+sulfuric acid catalyst—>

6.Draw galvanic cells based on the net ionic equations for the following reactions. For each reaction:

• Label the anode and cathode.
• Write the oxidation and reduction half reactions for the cell.
• Indicate the electrode materials, and electrolyte components.
• Indicate the direction of electron flow and ion migration.

Note: The spectator ion in each reaction is SO₄^2-. Draw the galvanic cells using a salt bridge with Na₂SO₄ as the electrolyte.

a. Fe + Sn2+ = Fe2+ + Sn

b. Al + 3Ag1+ = Al3+ + 3Ag

c. Mg + Fe2+ = Mg2+ + Fe

= means arrows like these as well just in case it’s confusing -->

7. Write the cell notation for each cell in question 6.

if you have $100 in your pocket. if gasoline cost $3.63 per gallon and your car gets 35 miles to then gallon, how many miles can you go with $100?