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A Sunscreen preparation contains 2.50% by mass benzyl salicylate. If a tube contains 4.0 ounces of sunscreen, how many kilograms of benzyl salicylate are needed to manufacture 325 tubes of sunscreen?
A protein biochemist attempted to determine the amino acid sequence of a decapeptide. Use the results from the trypsin, chymotrypsin, and cyanogen bromide treatments to suggest the amino acid sequence of this decapeptide.
what properties of matter only apply to solids? what properties of matter only apply to liquids andor gasses? any
A solution of .601g of the solid in 34.1g of the solvent diphenyl gave a freezing point depression of 1.17 degree celsius. Calculate the molar mass and molecular formula of the solid(k1 for diphenyl is 8.00 degree celsius/m)
A 24.7 g sample of pure iron at 61°C is dropped into 99 g of water at 25°C. What is the final temperature of the water-iron mixture?
a. exchanges energy when a phosphate bond is hydrolyzed b. the high energy form of coenzyme A c. the oxidized form of nicotinamide adenine dinucleotide.
Calculate the number of grams of aluminum required to prepare 500.0g of chromium metal.
given that 10.0 grams of metal at 99.0oc are placed in 50.0 grams of water at 24.0 oc in a perfectly insulated
A reaction that is used to propel rockets is N2O4(l) + 2N2H4(l) --> 3N2(g) + 4H2O(g). This reaction has the advantage that neither product is toxic, so no dangerous pollution is released.
Carbon sequestration technologies are being actively explored by researchers as methods to remove CO2 from the atmosphere, thereby diminishing the greenhouse effect.
A 460 mL sample of oxygen (O2) was collected by displacement of water at 24 ? C under a total barometric pressure of 1095 torr. What mass of dry oxygen was collected? The vapor pressure of water at 24 ? C is 22 torr
Sodium bicarbonate and sodium carbonate dissolved in water use to make buffer solution. The Ka value of carbonic acid is 4.37 x 10^-7 and sodium carbonate is 4.68 x 10^-11.
An atomic emission spectrum of hydrogen shows the following three wavelengths: 121.5 {\rm nm}, 102.6 {\rm nm}, and 97.23 {\rm nm}. Assign these wavelengths to transitions in the hydrogen atom
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