Chemistry Answers

Why is it neccessary to acidify iron solution before titration

How does pressure affect the solubility of a gas in a liquid?

Calculate the molar mass of the solute in a solution of 2.47g of a nonelectrolyte in 100 g of acetic acid (CH₃COOH). The solution freezes at 1.3 °C below the normal freezing point of pure acetic acid. (Kf for CH₃COOH = 61.8°C/m)

A 1.50 g sample of a compound containing only C,H and O was burned completely. The only combustion products were 1.738 g CO2 and 0.711 g of water. What is the empirical formula and molecular formula of the compound? (MW = 152g/mol)

A wooden object found in an Indian burial ground and subjected to radiocarbon dating. The decay rate associated with C- 14 is l0 disintegrations per minute per gram carbon. What is the age of the object?

What pressure is required to reduce 64 mL of a gas at standard conditions to 17 mL at a temperature of 29◦C? Answer in units of atm.

What are the freezing point and boiling point of a solution that contains 5 g of glycerol (C₃H₈O₃) and 20 ml of water. 

Assuming Raoult’s law applies, calculate the vapor pressure of a solution of 45 g of glucose (C₆H₁₂O₆) in 95 g of water at 25 degrees Celsius

Sphere A and B have the same initial positive charge q0. The magnitude of the repulsive electric force between the two spheres is 14.1 N when separated by a distance of 0.03 m. (a) find the initial charge q0. (b) The spheres are then allowed to touch each other and the separated. Find the electric force between them if the radius of sphere A is there times that of sphere B.

Predict the atomic radius of antimony given the radius of arsenic (0.125nm) and bismuth (0.155nm)