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Consider a cup of coffee that has a temperature of 93oC. Assume the mass of the coffee is 550 g and that the specific heat of coffee is about the same as the specific heat of water. Is a 230 g ice c
A 5.0 g sample of hemoglobin requires 21.6 mL of 0.00310 M potassium permanganate. What is the percent of iron in the hemoglobin sample
The volume of 4 cubic meters of gas is kept under constant pressure. its tempeture is increased from a minus 73 degrees celsius to 127 degrees celsius. What is the new volume of the gas?
Calculate the percent yield for the reaction: P4 (s) + 6 Cl2 (g) → 4 PCl3 (l) if 75.0 g of phosphorus reacts with excess chlorine gas to produce 111.0 g of phosphorus trichloride.
Octane has a density of 0.692 g/mL at 20 degrees Celsius. How many grams of O2 are required to burn 1.00 gal of C8H18?
A 39 L tank contains a gas under a pressure of 186 atm. What volume would the gas occupy at the same temperature at 550 torr of pressure?
Why is the identity of an element determined by the number of protons in its nucleus? Why can't the identity be determined by the number of neutrons or the number of electrons?
The same volume ofCO2 at the same temp. and pressure is liberated from 1.000g of dolomite byadding an excess of HCl, as can be liberated by addition of 35.0mL of 0.500 N HCl to an excess of any car
Calculate the fraction of methyl isonitrile molecules that have an energy of 160.0 kJ or greater at 510k and 514 k. What is the ratio of the fraction at 514 k to that at 510 k.
Write the mathematical expression for the equilibrium constant Keq, as a function of the concentrations of the products and reactants for this reaction.
Calculate the alkaline strength of a sample of impure K2CO3 in terms of per cent K2O from the following data: Wt. of sample=1.000g; HCl used= 55.90mL; NaOH used=0.42mL; 1.000mL NaOH=0.008473g KHC2O
A fishing boat accidentally spills 9 barrels of diesel oil into the ocean. Each barrel contains 42 gallons. If the oil film on the ocean is 2.5 × 10^2 nm thick, how many square meters will the
Calculate the mass of nitrogen dissolved at room temperature in an 77.0 home aquarium. Assume a total pressure of 1.0 and a mole fraction for nitrogen of 0.78.
How many grams of F2 are needed to produce 120. g of PF3 if the reaction has a 78.1% yield?
What is the final volume of a 400 mL gas sample that is subjected to a tempature change from 22 degrees celcius to 30 degrees celcius and a pressure change from 760 mm Hg to 360 mm Hg?
The 1H NMR spectrum of compound A has one singlet integrating to 1 H, two doublets integrating to 3 H and 6 H, and two multiplets each integrating to 1 H. The 1H NMR spectrum of compound B has a sin
What two steps in the reaction are accelerated by the presence of strong acid, and what function does the acid play in each of these steps?
An auto bumper is coated with a layer of chromium, 0.017 cm thick. The bumper has a surface area of 3.43 x 104 cm2. The density of chromium metal is 7.19 g/cm3. How many atoms of chromium are used i
A sample of chlorine, which has an average atomic mass of 35.86, consists of two isotopes with mass of 35 and 37. What is the percent (to 0.1%) abundance of the 37 isotope?
A solution is prepared by dissolving 15.0g of nh3 in 250g of water. The density of resulting solution is 0.974g/ml. Calculate the molarity of nh3 in the solution described above
Which 1.0 M acid solution has the largest concentration of hydronium [h3O+]?
Find the standard potential of the half-reaction. Notice the relation between first 2 equations and the desired equation. Convert Ksp and Eo to ΔGo.
sample of sodium reacts completely with 0.142kg. of chlorine, forming 234 g. of sodium chloride. what mass of sodium reacted?
Actually, the resulting mixture could be safely disposed of by pouring it into the drain and diluting with a large amount of running water. describe the harzards of each of the solutions. Explain wh
a 1.00L buffer solution is 0.250 M in HF and 0.250 M in NaF. Calculate pH of the solution after the addition of 100.0mL of 1.00M HCl. Ka for HF is 3.5x10^-4.