Organic Chemistry Answers

A compound contains 12.8grams copper 6.4grams sulphur 12.8grams oxygen and 18grams of crystallisation find the simpless formulae of the compound

Maleic acid is an organic compound of 41.39 % C 3.47 % acid has a mass of 15 g .what are the empirical and molecular formula of maleic acid

1.     Glucose and Fructose belongs to the carbohydrate family but they react differently, which functional group makes them different from one another and how would you distinguish them by giving simple chemical test?                                                                          (03)

v Categorize the functional group in the given compound and how would you justify the presence of these functional groups by performing simple chemical tests?

A.   PHENOL.

B.    BENZENE RING.

C.   AMINE.

D.   KETONE.

E.    ETHER

F.    ALDEHYDE

2-bromo-3,3-dimethylbutaneis heated in ethanol for an extended period of time and three elimination products are formed. Write complete mechanism for their formation.

Given 2CuO_(g) -> 2Cu_(s)+O_2(g) ΔH°= 314.6 kJ

a. Determine the heat of formation of CuO.

b. Calculate the standard enthalpy change for the formation of 13.58 g of CuO.

Compute for the standard change in enthalpy of the following reactions:

(A) PbO_(s)+C_(s) -> CO_(g)+Pb_(s)

(B) Ca(OH)_2(s)+CO_2(g) -> CaCO_3(g)+H₂O_(g)

(C) 2H₂SO_4(l) -> 2H₂O_(g)+O_2(g)+2SO_2(s)

Given the following reactions, calculate the heat of formation of hydrazine in megajoules.

(A) H_2(g)+1/2 O_2(g) -> H₂O_(g) ΔH= -241.8 kJ

(B) N₂N_4(l)+O_2(g) -> N_2(g)+2H₂O_(g) ΔH= -534.2 kJ

Given the following thermochemical equations, calculate the change in enthalpy for the

formation of one mole of dinitrogen pentoxide from its elements in their stable state at

25°C and 1 atm.

(A) 2H_2(g)+O_2(g) -> 2H₂O_(l) ΔH= -571.6 kJ

(B) N₂O_5(g)+H₂O_2(l) -> 2HNO_3(l) ΔH= -73.7 kJ

(C) 1/2N_2(g)+3/2O_2(g)+1/2H_2(g) -> HNO_3(l) ΔH= -174.1 kJ

Calcium carbide, CaC₂, is the raw material used for the production of acetylene

, C₂H₂ ,(used in welding torches). Calcium carbide is produced by reacting calcium oxide with carbon, producing carbon monoxide, CO as a byproduct. When one mole of calcium

carbide is formed, 464.8 kJ of heat is absorbed,

CaO_(s)+ 3C_(s) -> CaC_2(s)+ CO_(g) H = 464.8 kJ

a. What is the change in enthalpy when 1.00 g of calcium carbide is formed?

b. If the enthalpy change for the reaction is 246.7 kJ, what mass of calcium carbide is

produced?

c. What is the enthalpy change if 46.7 g of carbon reacts with excess calcium oxide?

d. How many grams of carbon are used up when 20.00 kJ of heat are absorbed?

e. How many gigajoules of energy is required to consume 1.38x10⁵g calcium oxide?