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Caffeine consists of C, H, O and N. While 3.0849 grams of caffeine is burne din an excess of O .6964 grams of CO2 and .01782 grams of water are formed. Caffeiene is 28.84% N by mass. It's molar mass is between 190 and 200 grams/mol. Explain what is the formula for caffeine?
Calculate the partial pressure of water above the solution, in torr.The vapor pressure of pure water at 55°C is 118.0 torr. The MW of lactose is342.3 g/mol
Depict the structures of the compounds and predict whether they can diffuse across a membrane without facilitated diffusion. Define why you came to this conclusion.
While a 1.00 L flask containing 1.500 atm of gas A is joined with a 1.00 L flask containing 0.750 atm of gas B, as well as the stopcock between the flasks is opened, also the gases are allowed to mix thoroughly, the following reaction proceeds at ..
The fluorocarbon compound C2Cl3F3 has a normal boiling point of 47.6 C The specific heats of C2Cl3F3(l) and C2Cl3F3(g) are 0.91 J/g-K and 0.67 J/g-K, respectively.
A sample of sodium metal having a mass of 5.45 g reacts with excess water, and the water is later evaporated. What is the solid product that remains after evaporation, and how many grams of this product are expected to be formed
the limiting current of lead in an unknown solutions is 5.60mua. one ml of a 1.00 x 10-3m lead solution is added to
A neutral amino acid has a pka1 of 4.0 and a pka2 of 10.0. What is the pH of the solution of this amino acid if 80% is in the acid form and 20% is in the base form.
How many kilograms of sodium carbonate must be added to neutralize 2.01×103 kg of sulfuric acid solution?
Why is it particularly important to wash the cupric hydroxide intermediate in the synthesis of cupric acetate (verdigris)? Be specific about what is being removed and why it matters.
a. determine the electron-domain geometry of osf4b. draw two possible molecular geometries for the molecule based on
An electron in the n = 7 level of the hydrogen atom relaxes to a lower energy level, emitting light of 397nm. What is the value of n for the level to which the electron relaxed?
the empirical formula for a group of compounds is chcl. lindane a powerful insecticide is a member of this group. the
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