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Caffeine contains by mass 49.5% C, 5.15% H, 28.9% N and 16.5% O, and the molecular mass is 195g/mol. What are the empirical and molecular formulas of caffeine?
The empty bottle weighs 14.23 g. What is the density of the metallic solid expressed in g/cm3
25 ml of naoh 0.16 m is added to 50 ml of 0.1 m hcl. what is the ph of the final solution? what is the concentration of
Incandescent white of a fireworks display is caused by the formation of P4O10, which occurs by the combustion of phosphorus, if 1.75 mol P reacts with 2.00 mol O2, how many grams of P4O10 can be produced
The van't Hoff factor for KCl is i = 1.85. What is the boiling point of a 0.90 m solution of KCl in water. For water, Kb = 0.51 C*kg/mol
The index of refraction of the glass is 1.42. At what angle from the normal does the beam travel through the glass (in degrees)?
A researcher suspects that the pressure gauge on a 49.9-L gas cylinder containing nitric oxide is broken. An empty gas cylinder weighs 135 lb. The weight of the partially full cylinder is 161.5 lb. This cylinder is located in a relatively chilly s..
Calculate the energy of a photon emitted when an electron in a hydrogen atom undergoes a transition from n = 4 to n = 1. I need an explanation of the formula too.
You dissolve 261 mmol of sodium bicarbonate into a total volume of 1.2 L. What is the molarity of sodium bicarbonate in this solution?
What is the volume in mL of 0.833 M HCl(aq) needed to reach halfway to the equivalence (stoichiometric) point in the titration of 23.5 mL of 0.270 M ethylamine
Some standard reduction potentials at 25oC are: Eo = 0.337 V for Cu2+(aq) + 2e- ? Cu(s)
Mass spectrometry determined the molecular mass to be 166 g/mol. Finally, a 0.1680 g sample was titrated to the end point with 16.18 mL of 0.1250 M NaOH. What is the molecular formula for the acid. Is the acid mono-, di-, or triprotic.
What is the fuel value (in nutritional Cal) if the temperature of the water increased 4.07°C? Enter your answer in the provided box.
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