bromine

Hi-Please explain as ELEMENTARY as possible Bromine is one of the only two elements that is liquid at room temp. Bromine has a heat vap of Hvap = 30.91kJ/mol and its boiling point is 59EC. What is the entropy of vaporization for bromine?

solvent

Please explain with the math being as elementary as possible A solution of 0.2113g of water dissolve in 25.0 g of a solvent freezes at 11.5 EC below the freezing point for the pure solvent. What is the K sub f for this solvent?

Boiling Point

Chloroform has a Hvap = 29.2 kJ/mol and has a Svap=87.5 J/(molK). What is the boiling point of chloroform in Celsius?

vapor pressure

Hi-Please explain as ELEMENTARYas possible-thank you(-:! A liquid has a heat of vaporization of 35.5kJ/mol and a boiling point of 122 EC at 1 atm. What is its vapor pressure at 109EC?

Molarity

Hi-Please explain all math as ELEMENTARY as possible-thanks. Ehylene glycol, C2H6O2 (MW=62.1mol) with density of 40.0mass % solution of ethylene glycol in water is 1.0514g/mL at 20EC. Calculate molality of solution. Calculate Molarity of solution.

freezing temperature

Hi-Please explain math as ELeMenTary as possible-thank you. If the freezing point of pure water is 0.00EC and the freezing point depression constant for water is Ksub f = 1.86Ec/molal, calculate the freezing temperature for the ethylene glycol solution in the previous problem-#42907.

Graph

Problem: Attached is graph. What phase changes occur when the temp is held constant at 150EC and the pressure is increased from 0.25 atm to 1.4 atm? Gas-liquid-solid? Gas-solid-liquid? Liquid-solid-gas? or Solid-liquid vapor?

Reactiveness

Expain why dinotrogen, N2, is a very stable molecule, but ethyne, C2H2, is very reactive. Note that both molecules have triple bonds.

Chem

I'm taking a chemII class in summer B and it is very fast paced. The Professor will give us a mid-term and a final but, the take home exams are a chance to get good scores to pass the class. 1) Calculate the hydrogen ion concentration and the pH of the solution formed when 0.020 gram-formula weight of nitric acid is added ...continues

Joules...

Water with a mass of 595.8 g. from 48.69 C to 56.58 C. What is heat change in Joules? Problem, where does the 4.184 come from? 4.184 x 595.8 x (48.69 - 56.58) = 19670 Joules