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Sucrose (C12H22O11 FW=342.2965) combusts in oxygen to generate carbon dioxide and water vapor. When 20-g sample of it is combusted in a bomb calorimeter with a calorimeter constant of 6.595 kJ/ degrees Celsius, the temperature increases from 25.0 degrees celsius to 72.21 degrees celsius. Determine the heat of combustion (kJ/mol) for sucrose.
What is the major disadvantage of using concentrated sulfuric acid (or hydrochloric acid) rather than 85% phosphoric acid for the dehydration of alcohols?
A sample of pure NO2 is heated to 336 C at which temperature it partially dissociates according to the equation2NO2->O2+2NO
The elements contained in acetylsalicyic acid are hydrogen, carbon, and oxygen. The combustion of 3.000 g of the pure compound yields 1.200 g of water and 3.72 L of dry carbon dioxide, measured at STP
an 18-karat gold necklace is 75 gold by mass 16 silver and 9.0 copper. how many grams of copper are in the necklace? if
How would you prepare 350. ml of a 0.1 M solution of NaOH from pure pellets. From 95% pure pellets
A 25.0 mL sample of river water was titrated with 0.0010 M Na2Cr2O7 and required 8.3 mL to reach the end-point. What is the chemical oxygen demand, in milligrams of O2 per liter, of the sample?
What happened to the fabric strip when it was treated with the Test Identification Stain? How might this dye be used
Suppose that you have 0.500 L of each of the following solutions, and an unlimited supply of water. (Note: C9H7NHBr is a salt containing the ions C9H7NH+ and Br
An unknown liquid boiling around 185 +/- 5 degrees C in 5% HCl and in a pH 5.5 buffer but is insoluble in water. Shaking the unknown with p-touluenesulfonyl chloride in aqueous NaOH produces a white precipitate that doesn't dissolve in dilute HCl...
A pure titanium cube has an edge length of 2.65. How many titanium atoms does it contain. Titanium has a density of 4.50g/cm^3
As a scuba diver descends under water, the pressure increases. At a total air pressure of 2.89 atm and a temperature of 25.0 celcius, what is the solubility of N_2 in a diver's blood?
use the half reaction method to balance each of the following in acidic solution except as indicated
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