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A sample of air contains 78.08 % nitrogen, 20.94 % oxygen, 0.05% carbon dioxide, and 0.930% argon by volume. How many molecules of each gas are present in 1.00 L of the sample at 39 C and 1.00 atm?
A 45-g piece of ice at 0 degrees C is added to a sample of water at 9 degrees C. All of the ice melts and the temperature of the water decreases to 0 degrees C. How many gram sof water were in the
Determine the percent yield for the reaction between 28.1g of Sb4O6 and excess c if 17.3 of Sb is recovered along with an unknown amount of CO.
If the three gases are mixed in a rigid container at 500 K so that the partial pressure of each gas is initially one atm, what will happen?
when carbon is burned in the presence of oxygen, the carbon and oxygen combine to produce carbon dioxide. if you start with 3 grams of carbon and 8 grams of oxygen and they react completely, how man
Estimate the mass of water that must evaporate from the skin to cool a body by 0.90 degrees Celcius, if the mass of the body is 94 kg and its heat capacity is 4.0.
Calculate the molar mass of the biomolecule. For carbon tetrachloride, the boiling point constant is 5.03°C · kg/mol, and the boiling point of pure carbon tetrachloride is 76.50°C.
A steel cylinder holds 1.60 g of ethanol, C2H5OH. What is the pressure of the ethanol vapor if the cylinder has a volume of 244 cm3 and the temperature is 250°C?
If you place 7>50 mg of Xe(CF3)2 into a flask, how long must you wait until only 0.25 mg of Xe(CF3)2 remains?
The concentration of cholesterol in the blood serum of a normal adult is approx 200mg/dL. How many grams of cholesterol does a person with a blood volume of 5.75L have circulating in his or her bloo
Calculate the final temperature of the mixture assuming no heat loss to the surroundings. The heat capacities of H2O(s) and H2O(l) are 2.08 and 4.18 J/g · °C, respectively
Calculate the molecular mass of the nonionic solutes: 8.02 g of solute in 861 g of water lower the freezing point to -0.430 degrees C.
What is the change in enthalpy when 18.4 g of steam at 100?C is converted to liquid waterat the same temperature and pressure? Theheat of vaporization of water is 40.7 kJ/mole. Answer in units of kJ
Assume that the heat required for the vaporization of the alcohol comes only from the aluminum block and that the alcohol vaporizes at 25.
Write an assay / paper review on the application of suspended particles or particles (solid form, liquid or gas) such as in medicine, drug delivery system.
Suppose that 0.92 of water condenses on a 85.0 block of iron that is initially at 22. If the heat released during condensation goes only to warming the iron block, what is the final temperature (in
In certain cases calcium hydroxide and sulfuric acid react to produce calcium bisulfate and water. When 0.0720 mol H2SO4 are reacted with 0.0240 mol Ca(OH)2, how much calcium bisulfate is produced?
25.0 mL of ethanol (density = 0.789 g/mL) initially at 5.4°C is mixed with 34.6 mL of water (density = 1.0 g/mL) initially at 25.3°C in an insulated beaker. Assuming that no heat is l
Hydrogen sulfide ion, HS-, is a weaker base than ammonia, NH3. When ammonia reacts with hydrosulfuric acid, H2S, what species are present in the solution in the largest amount?
The equation shows the combustion of butane (C4H10). How many moles of water can be produced by 12.5 moles of C4H10 with excess oxygen?
Fe203 is converted into metallic Fe plus H2O(g). If the residue weighs 1.774 g, what is the weight percent of Fe2O3 in the original mixture?
1.45 g sample of an iron ore is dissolved in acid and the iron obtained is fe2+ (aq). To titrate the solution, 21.6 mL of 0.102 M KMnO4(aq) is required. What is the percent of iron in the ore?
What is the freezing-point depression of the solvent if the freezing point constant is -1.86 °C/m? Show all of the work needed to solve this problem.
0.2 M HCl is used to neutralize 20 mL of 0.35 M NaOH. How many moles of H+ are needed to neutralize the OH-?
Calculate the wavelength in picometer of gamma ray radiation whose frequency is 9.74 × 1019 Hz. Express answer in scientific notation.