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1. Calculate the vapor pressure of a solution made by dissolving 65.0 g CaCl2, C6H12O6, in 655 g of water. The vapor pressure of pure water is 47.1 torr at 37°C.




2. What is the vapor pressure of an aqueous solution that has a solute mole fraction of 0.2000? The vapor pressure of water is 35.576 mmHg at 25 °C.

complete the equation in your answer booklet for the decay of phosphorus-30 by writing a notation for the missing product.


Question:

Lomefloxacin (molar mass 351.3g/mole), strongest base pKa is 8.78 and it’s strongest acid pKa is 5.45. At pH 3 Lomefloxacin solubility is 109.3mg/mL.


Determine the minimum solubility of Lomefloxacin to 1 d.p. Express the minimum solubility as a molarity.


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exactly 15.6 g of cab4 compound was dissolved in 1500 cm³ of water. calculate the total number of b atoms in 500 ml of the solution. 


How do you infer that cathode rays are ubiquitous for all matters? 


draw the resonance structure of cyanate ion. out of them which one is less important as a resonance structure and why?



Caffeine, a stimulant found in coffee and some soft drinks, consists of 49.5% C, 5.15% H, and 28.9% N by mass; the rest is oxygen. Given the molar mass of caffeine is 195 g/mol, determine its molecular formula.


Vanillin, the compound responsible for the flavour vanilla, has a percentage composition of 63.2% C,

5.26% H, and 31.6% O by mass. Determine the empirical formula of vanillin.


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