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Explain if you dissolve .95 grams of an unknown salt into 13 grams of Benzene (C6H6) as well as find that the new freezing point is 2.78°C, define what is the Molar Mass of the unknown? Compute what the new boiling point would be. Define what would the mole fraction of Benzene be?
A chemist must dilute 80.5mL of 126mM aqueous sodium thiosulfate solution until the concentration falls to 110.mM . He'll do this by adding distilled water to the solution until it reaches a certain final volume.
Find the enthalpy change for the chemical reaction below PCl5(g) ----> PCl3 (g) +Cl2 From the following equations:
What is the boiling point of a 4.08 m solution of naphthalene in benzene. The boiling point of benzene is 80.1°C. here is some information to help you on this problem.
What is the theoretical yield and limiting regent if 2.6 g of benzaldehyde is reacted with 0.7 g of acetone to produce dibenzalacetone
What is the sum of the stoichiometric coefficients when the reaction is balanced to lowest common denominator
Calculate the number of photons emitted in one second by a 13 W laser operating at a wavelength of 400.0 nm. photons
You have a choice of a p-20 ,p-100,p-200,p-1000,a 1mL serological pipette , and a 5mL serological pipette. Which one(s) would you choose to make this standard and why? Explain how you would calibrate the pipette(s) you choose.
The solubility of calcium chromate is 1.56 ×10-3 g/100 mL of solution. What is the Ksp for CaCrO4?
An aqueous solution is 48.3% by mass hydroiodic acid, HI. The density of this solution is 1.6 g/ml at 20 C. How many grams of pure HI are there in 190.0 ml of this solution at 20.0 C?
Consider the reaction that describes the Haber process for the production of ammonia: for which Kc at 300oC is 9.5. Calculate Kp for this reaction at 300oC.
What volumes of the stock solution will you have to pipet into the flasks to prepare standards and What mass of gas does the container contains If the volume of a container
A 5 kg aluminum block sits in your lab, which is at 21 C. You wish to increase the temperature of the block to 50 C. How much heat in [J] must be supplied
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