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To the nearest hundredths of a gram, determine the gram molecular mass of caffeine. A "Big Gulp" of Mountain Dew contains 128 mg of caffeine per 830 mL of solution. The molecular formula of caffeine is C8 H10 N4 O2.
The half life of polonium-210 is 138.4 days. How many milligrams of polonium-210 remain after 415.2 days if you start with 2.0 mg of the isotope?
A solution of 75.0 g of benzene (C6H6) and 75.0 g of toluene (C7H8) has a total vapor pressure of 80.9 mmHg at 303 K. Another solution of 100.0 g benzene and 50.0 g toluene has a total vapor pressure of 93.9 mmHg at this temperature.
an unknown gas sample is collected in a 255 ml countainer at 25c and 755 mm hg. how many moles of gas are present?
Draw a two-dimensional conformational energy landscape (free energy on y-axis, conformational coordinate on x-axis) to show how a protein may become kinetically (not thermodynamically) ‘trapped' in a misfolded conformation.
A vapor composed of 0.75 mole fraction ethanol and 0.25 mole fraction acetic acid at 120.0 mm Hg (absolute), is in equilibrium with a liquid phase also composed of ethanol and acetic acid.
What is the molarity of a sodium hydroxide solution if 34.26 mL react with 0.337g of sulfamic acid
The raw sewage of a wastewater treatment plant has a BOD5 of 230 mg/L and suspended solids of 350 mg/L. Estimate the BOD5 and suspended solids concentrations in the primary effluent (assume typical removal efficiency for both parameters).
A metal is electrolyzed from aqueous solution by using an electrical current of 1.23 A for 2½ h, and 3.37 g of metal is deposited. In a separate experiment the number of electrons used for the reduction of the metal is 2.
The managing director of a well-known company on Wall Street thrives on a diet of fruit jam, bread, pasta, and coffee. She exercises intermittently.
Calculates the molarity of a calcium carbonate standard solution that contains 0.2430 grams of calcium carbonate dissolved in a total of 250.0 mL
The heat capactiy of the calorimeter is 1630 J/degrees celsius, and the inital temperature was 24.58 degrees celsius. What was the final temperature in degrees celsius?
If 5 moles of propane and 10 moles of oxygen are sealed in a container and burned, which reactant will be the limiting reactant, and how many moles of carbon dioxide will be produced?
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