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You take 306.5 g of a solid at 30.0 C and let it melt in 400. g of water. The water temperature decreases from 85.1 C to 30.0 C. Calculate the heat of fusion of this solid.
In fermentation of glucose, 780 mL of CO2 gas was produced at 37 degrees C and 1.00 atm. What is the volume(L) of the gas when measured at 22 degrees C and 675 mmHg?
Ethanol (molar mass = 46 g/mol) can be dehydrated to yield ethene (molar mass = 28 g/mol) by heating it with an excess of concentrated sulfuric acid (acting as a catalyst).
Describe the nature and characteristics of PCB's. Why are they of importance to an EH&S or FS professional who encounters them when coming upon an incident scene where they are present?
Calculate pH and the concentration of acetate ion resulting from the mixtureof 400ml of 0.1M formic acid and 100ml 0.1 sodium acetate.
Lead(II) sulfide reacts with hydrogen peroxide to form lead(II) sulfate and water. How many grams of hydrogen peroxide are needed to react completely with 265 g of lead(II) sulfide?
A buffer solution contains .20 M aniline (C6H5NH2 Kb= 3.9 *10^-10) and .20 M anilinium chloride (C6H5NH3^+) Cl^-. What is the pH of this solution
For analysis, a short peptide seven residues long is treated with FDNB, followed by complete acid hydrolysis and amino acid chromatography. What are the products of these steps. What kind of information can be obtained by amino acid chromatography..
If 43.2 ml of 0.105 M KMnO4 were required to reach the endpoint of a 14.8g bleach sample, what was the perrcentage of H2O2 in the sample?
How to calculate the pH of 0.375 L of a 0.18 M acetic acid-0.29 M sodium acetate buffer before and after the addition of (a) 0.0060 mol of KOH and (b) 0.0060 mol of HBr.
Calculate the values for Z1 and Z11 for mercury (Hg) vapor at 40 degrees C at P = 0.10 atm. How does this quantity depend on pressure
a toothpaste contains 0.24% by mass sodium fluoride, NaF and 0.30% by mass of triclosan, C12H7Cl3O2. The mass of one toothpaste is 119g. How many moles of C atoms are in the toothpaste.
the sample has a mass of .211 grams,a volume of .25 and a temperature of 275K at a pressure of .945 atmospheres. What is the most likely element forming the sample?
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