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A solution of ammonia and water contains 1.10×1025 water molecules and 5.00×1024 ammonia molecules. How many total hydrogen atoms are in this solution?
If a blue light has a wavelength of 5.50 x 10-7 (550 nanometers), what is the frequency of the light?
The rate constant of a reaction is 4.7 multiplied by 10-3 s-1 at 25°C, and the activation energy is 33.6 kJ/mol. What is the value of k at 75°C?
If 32 mL of 6.8 H2SO4 was spilled, what is the minimum mass of NaHCO3 that must be added to the spill to neutralize the acid?
A 2.40-g sample of a large biomolecule was dissolved in 13.0 g of carbon tetrachloride. The boiling point of this solution was determined to be 77.85°C. Calculate the molar mass of the biomolec
If a 2 m telescope is observing a wavelength of 600 nm, what is the smallest resolvable angle in arc seconds?
Calculate the density of a solid cube that measures 4.79 cm on each side and has a mass of 420
A 2.5-L sample of a 6.3M NACl solution is diluted to 75L. What is the molarity of the diluted solution?
Determine the emf of a fuel cell that oxidizes hydrogen according to the reaction:
Calculate the molality and molarity of an NH3 solution made up of 37.0 g of NH3 in 70.0 g of water. The density of the solution is 0.982 g/mL.
Consider 25.0 g of water at 21.7°C that are mixed with 25.0 g of water at 43.3°C in a foam cup calorimeter. The equilibrium temperature reached was 30.4°C. Calculate the calorimeter con
A sample of H½O with a mass of 46.0 grams has a temperature of -58.0 àC. How many joules of energy are necessary to melt 46.0 grams of ice? (Use 2.1 J/gàC for the specific heat of
What volume and mass of steam at 100 degrees C and 1.00 atm would, during condensation, release the same amount of heat as 100.cm^3 of liquid water during freezing? What do you note, qualitatively,
Calculate the pH at the equivalence point for the titration of a solution containing 1250.0 mg of hilariamine (MW = 104.75 g/mol, Kb = 7.1×10-4) with 0.1000MHCl solution.
With this, and assuming a space crew of five, how much LiOH must be taken in a seven day mission? Take into consideration a safety factor of 200%.
If 18.4 mL of 0.800 M~rm HCl solution are needed to neutralize 5.00 rm mL of a household ammonia solution, what is the molar concentration of the ammonia?
A student reported the following % for his unknown mixture: 25% NH4Cl, 30% NaCl, and 50% SiO2. Assuming that the calculations were done correctly, explain the students error.
The mixture of hot iron and aluminum is then dropped into 96.0 g of water at 20.7°C. Calculate the final temperature of the metal and water mixture, assuming no heat loss to the surroundings.
A gaseous mixture of and contains 36.8 nitrogen by mass. What is the partial pressure of oxygen in the mixture if the total pressure is 685 ?
The rate constant for the reaction at 30oC is 0.120 L*mol-1*s-1. How long does it take an initial concentration of 0.150 mol/L to reduce to one-quarter the initial concentration?
A 40.0 mL sample of oxygen is collected by water displacement at 24.0 degrees celcius. What volume would the dry gas occupy at standard pressure if the original pressure is 98.5 kPa?
When 10cm3 of a gaseous hydrocarbon CaHb was exploded with an excess of oxygen, a contraction of 35cm3 occured (all volumes are measured at rtp). On treatment of the product with NaOH solution, a co
A bicycle tire is filled with air to a pressure of 100. psi at a temperature of 19 degrees celcius. Riding the bike on asphalt on a hot day increases the temperature of the tire to 58 degrees celci
Despite the expected decrease in atomic size, there is an unexpected drop in the first ionization energy between Groups 2A and 3A in periods 2 through 4 (e.g., Be to B). Explain this pattern in term
What can you conclude about the reaction from the influence of temperature on the equilibrium. What can you conclude from the influence of increasing the volume.