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Suppose a cup of coffee at the campus coffee shop is $1.50, and a cup of hot tea is $1.25, and a student's beverage budget is $20 per week. What is the most cups of tea the student could buy?
Assume the Pacific Ocean has a surface area of 1.7 x 108 km2 and an average depth of 3900 m. Calculate the volume of water in the ocean in liters
THE TEMPERATURE OF THE BALLOON IS INCREASED TO 38.0oC as it expands to a volume of 998L, the presure remaining constant. Calculate q, w, and delta E for the helium in the balloon.
Concentrated hydrochloric acid is 38% HCl by weight and has a density of 1.19 g/mL. A solution is prepared by measuring 63 mL of the concentrated HCl, adding it to water, and diluting to 0.900 L. Ca
If the total pressure in the flasks is 320 torr after the stopcock is opened, determine the initial pressure of N2 in the 1.00-L flask.
A solution of ammonia and water contains 1.40×10^25 water molecules and 5.30×10^24 ammonia molecules. How many total hydrogen atoms are in this solution?
Find the heat of combustion in kJ/g for each gas. These values are valid at 25°C, where the water produced by the reaction is in the liquid state.
Is it possible to use methylene blue to determine the concentration of ascorbic acid in orange juice?
Dinitrogen pentoxide, N2O5, decomposes in the gas phase to form nitrogen dioxide, NO2, and oxygen gas, O2. The reaction is first order in dinitrogen pentoxide and has a half-life of 2.81 hours at 25
If iodine gas reacts with excess fluorine gas to produce 7.575g of iodine pentafluoride gas, what was the pressure of the iodine gas before reacting if it was kept in a 1.5L flask at 298 k.
A sample of hydrogen gas was collected over water at 36°C and 855 mm Hg. The volume of the container was 6.50 L.
an electron is confined to a one dimensional box of length l it falls from the second energy level to the ground state and releases a photon with a wavelength of 322 nm. what is the length of the bo
Suppose you have a new thermometer called the X thermometer. On the X scale the boiling point of water is 130 degrees X and the boiling point of water is 10 degrees X. At what temperatures will the
A 25.0-mL sample of 1.00 M NH3 is titrated with 0.15 M HCl. What is the pH of the solution after 15.00 mL of acid have been added to the ammonia solution? Kb = 1.8 × 10¯5.
A solution is prepared by mixing 50.0 mL of 0.17 M Pb(NO3)2 with 50.0 mL of 1.9 M KCl. Calculate the concentrations of Pb2+ and Cl ‾ at equilibrium. Ksp for PbCl2(s) is 1.6 multiplied by 10-5.
Positrons cannot penetrate matter more than a few atomic diameters, but positron emission of radiotracers can be monitored in medical diagnosis. Explain
Consider the unbalanced equation: C5H12(l) +O2(g) --> CO2(g) +H2O(l) if 25.2 grams of pentane (C5H12) are burned in excess oxygen, how many grams of H2O will be produced?
If a 17.5 g sample of iron(III) oxide reacted with 5.00 L of carbon monoxide at 788 torr and 76 degrees celsius until one reactant is completely consumed, how many grams of iron are produced?
what volume of 0.684 M MnO4- solution is required to react completely with 27.50 mL 0f 0.250 M Fe+? This is an oxidation-reduction titration reaction with the following balanced chemical equation.
A sample of oxygen that occupies 1.00X 10^6 ml at 575 mm hg is subjected to a pressure of 1.25 atm. what will the final volume of the sample be if the temperature is held constant?
The lowest frequency of a large organ pipe is 30 s-1 and the highest frequency of a piccolo is 1.5 x 104 s-1. Find the difference in wavelength between these two sounds.
The solubility of O2 (g) in water is 4.43mg O2/100 g H2O (20ºC and 1 atm). What is the molarity (M) of this saturated solution?
The heat of combustion of hexane is 995.0 kcal/mol. How much energy is released during the complete combustion of 453 grams of hexane ?
The reaction caused the temperature of the water to rise from 21.0 to 24.7 celcius. What is the enthalpy of this reaction? Assume that no heat is lost to the surroundings or to the coffee cup itself
The distance between layers in a crystal is 321 pm. X rays are diffracted from these layers at an angle of 45.6°. Assuming that n = 4, calculate the wavelength of the X rays in nm.