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4.3 g of Sample D (molar mass = 82.5 g/mol) is combusted in a coffee cup calorimeter. 120 mL of H2O at 23.4°C increases to 28.9°C. What is the enthalpy change for the reaction of D in J/g?
What is the experimental yield (in g of precipitate) when 15.4 mL of a 0.6 M solution of iron(III) chloride is combined with 19.8 mL of a 0.719 M solution of lead(II) nitrate at a 80.1% yield
what is the volume of 1 mole of Helium gas when the pressure is 1.47 atm and the temperature is 287 K.
Calculate the pH for each of the following cases in the titration of 50.0 mL of 0.110 M HClO(aq) with 0.110 M KOH(aq).
A bottle contains 225 mL of insulin at a concentration of 50.0 mg/mL. What is the total mass of insulin in the bottle?
How many milliliters of 0.123 M H2SO4 are needed to neutralize 0.200 g of NaOH
Consider the reaction when aqueous solutions of barium acetate and chromium(III) iodide are combined. The net ionic equation for this reaction is
Determine how many atoms there are in 1 gallon using your knowledge of mole calculations and unit conversions. Assume that the molecular formula for gasoline = C6H14 ,the density of gasoline =0.85 grams/mL
What is the yield of ATP when Fructose-1,6-bisphosphate is completely oxidized to CO2 in mammalian cell? Assume that glycolysis, TCA, and oxidative phosphorylation are fully active.
The rate constant (k) for a reaction was measured as a function of temperature. A plot of ln k versus 1/T (in K) is linear and has a slope of -7445 K. Calculate the activation energy for the reaction
This solution is to be prepared by allowing water at a set pH to reach equilibrium with solid Fe(OH)3. What pH should be used for the aqueous solution to give this desired concentration of [Fe3+]
A 275.0 mL sample of O2 is collected over water at 60.0 degrees Celsius. The total pressure is 755 torr. What is the volume of the O2 at STP? (The vapor pressure of water at 60 degrees Celsius is 149 torr)
What mass of this substance must evaporate to freeze 185g of water initially at 17 degrees Celsius? (The heat of fusion of water is 334J/g; the specific heat of water is 4.18 J/g-K.)
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