Chemistry Answers

0.000675 M

 0.000675 M calcium hydroxide

An organic compound X contains 40% carbon, 6.7% hydrogen and the rest oxygen. The vapour density of X is 30. The compound reacted with a compound Y and a colourless gas Z which turn limewater milky. On boiling under reflux, the mixture of X and W, gives a sweet smelling liquid G was formed.i. determine the empirical and molecular formula of X.ii. identify Y, Z, W and G.iii. Give the formula of the functional group present in Xiv. Deduce the structure of the compound Xv. Name the reaction which take place between X and W, and write the equation for the reaction of X and W.

An organic compound X contains 40% carbon, 6.7% hydrogen and the rest oxygen. The vapour density of X is 30. The compound reacted with a compound Y and a colourless gas Z which turn limewater milky. On boiling under reflux, the mixture of X and W, gives a sweet smelling liquid G was formed.i. determine the empirical and molecular formula of X.

A 400 mL buffer solution was prepared by reacting sodium acetate, CH3COONa,

with 1.00 M acetic acid, CH3COOH, with a pH of 4.56 Calculate the mass of

CH3COONa required to prepare the solution. Ka CH3COOH= 1.75 x 10-5

Give an example of

a) an endothermic process that is spontaneous

b) an exothermic process that is spontaneous

c) a reversible process

d) an irreversible process

a solution of Ba(OH)2 was standardized against 0.1016g of primary standard benzoic acid C6H5COOH calculate the concentration of if the endpoint was 20.89mL

Balance the each of the following half-reactions and write the net-equation               

Al3+ (aq) + 3e- → Al (s)     and   Sn2+ (aq) + 2e- → Sn(s)

Pros and cons of acid and base

The heat of dissolution of a solid substance was determined using an insulated calorimeter containing 180 grams of water initially at 27.8°C. If the temperature of the water increased to 36.5°C, what is the heat (in J) of dissolution of the solid?