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How many joules of energy are needed to melt 54 grams of ice at its melting point? Assume that the molar heat of fusion of ice is 6 kJ/mol.
Bulb A with volume of 500 mL initially contains N2 at 0.7 atm pressure and 25?C. Bulb B, with volume of 800 mL initially contains O2 at 0.5 atm pressure and 0?
What is the alkali-aggregate reaction? List some of the rock types that are vulnerable to attack by alkaline solutions. Discuss the effect of aggregate size on the phenomenon.
Protons can be accelerated to speeds near that of light in particle accelerators. Estimate the wavelength (in nm) of such a proton moving at 2.90 X 108 m/s. (Mass of a proton=1.673 X 10-27 kg)
Titration of 80 ml of unknown concentration of H3PO4 requires 126ml of 0.128M KOH. What is the concentration of H3PO4?
working solution so you add five spatula tips full of salt to a large test tube and then make your working solution with only 5mL of deionized water.
In the reaction between glucose and oxygen 10.0 g of glucose reacts and 7.50 L of carbon dioxide is formed. What is the percent yield if the density of CO2 is 1.26 g/L?
Imagine that you have a 7.00 litre gas tank and a 3.00 litre gas tank. You need to fill one tank with oxygen and the other with acetylene to use in conjunction with your welding torch.
A mysterious material was purified from safflower oil (hint: full of fatty acids). Upon ozonolysis it gave the following compounds in their respective molar ratios.
It was found that 19.31 mL of an HCl solution are needed to react completely with 322 mL of a LiOH solution that has a pH of 11.56. What is the molarity of the HCl solution?
At a certian temperature and pressure, chlorine molecules hav an average velocity of 0.0610m/s. What is the average velocity of sulfur dioxide molecules under the same conditions.
In a 50.0 L container, 4.00 moles of chlorine and 2.00 moles of bromine are placed and kept at 293.0 K until equilibrium is reached. At equilibrium there are 82.63 g of Br2
M. tuberculosis, the organism that causes tuberculosis, can be completely destoryed by irradiation with UV light with a wavelength of 254 nm. What is the frequency?
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