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A system consists of 0.697 kg of water at 80 degrees C. A paddle wheel does 42 kJ of work stirring the water. The heat energy lost to the environment is 15 kJ. What is the final temperature of the s
The mass of ethanol needed to fill the tube is found to be 11.40 . The density of ethanol is 0.789. Calculate the inner diameter of the tube in centimeters.
A setup similar to the one shown in the figure below is often used in hospitals to support and apply a horizontal traction force to an injured leg. (Let m = 6.05 kg and ? = 81.0°.) (a) Determin
The resulting organic solution is extracted with 10ml of water. The Kp for 9-fluorenone in diethyle ether/water is 9.5, how much would remian in the ether layer?
Find the intensity of visible light in the spot if the intensity of visible light striking the lens is 791 W/m2
At equilibrium, the vessel contains 4.8 x 10^-3 mol NOCl, 1.6 x 10^-3 mol NO and 3.5 x 10^-3 mol Cl2. What are the partial pressures of the three gases at equilibrium?
A sphere of copper is subjected to 81.1 MPa of pressure. The copper has a bulk modulus of 130 GPa. By what fraction does the volume of the sphere change?
A 0.4512 g sample of a primary-standard-grade Na2CO3 required 36.44 ml of a H2SO4 solution to reach the end point of the reaction. CO32- + 2H+ → H2O + CO2 What is the molarity of H2SO4?
A sphere of copper is subjected to 81.1 MPa of pressure. The copper has a bulk modulus of 130 GPa. By what fraction does the volume of the sphere change? By what fraction does the radius of the sphe
For the equilibrium Br2 (g) Cl2 (g) <===> 2BrCl (g) at 400 K, Kc = 7.0. 0.28 mol of Br2 and 0.28 mol of Cl2 are introduced into a 1.0-L container at 400 K. What will be the equilibrium conce
Two forces F1 and F2 are acting on a mass M=6.0 kg. The force F1 = 5.0i + 7.0j + 2.0k, in N. The acceleration of the mass is given by a = 2.0i + 7.0j + 5.0k, in m/s2. Calculate the magnitude of F2.
Given the reaction X(aq) 3Y(aq) <===> 2Z(aq). Suppose the initial [X] is 0.55M and [Y] is 0.80 M. After equilibrium is reached, [X] = 0.35M. Calculate the Keq (Kc) for this reaction.
When .8436 mole of naphthalene(C10H8), a solid, is burned in a constant- volume bomb calorimeter at 298K, 5150 kJ of heat is evolved. Calculate delta H for the raction on a molar basis.
A certain first-order reaction has a rate constant of 2.75 x 10^-2 s^-1 at 20 degrees C. What is the value for k, the reaction constant, at 60 degrees if the Energy of activation = 75.5 kJ/mol?
Assuming ideality, calculate the vapor pressure of a 1.00 molal solution of a nonvolatile solute in water at 50 degrees celsius. The vapor pressure of water at 50 degrees celsius is 92.5 torr.
Dihydrogen pthalate (H2C8H4O4) is a diprotic acid. An analyte sample contains 0.127 M KHP and 0.0678 M (H2C8H4O4). What volume of a 0.205 M NaOH solution is required to neutralize 25.0 mL of the
A student rinsed a burette with deionized water but not with Na2S2O3 before filling the burette with Na2S2O3 to perform the titration of thiosulfate with potassium periodate.
Analysis of a compound containing only C and Cl revealed that it contains 33.33% C atoms by number and has a molar mass of 248.75 g/mol. What is the molecular formula of this compound?
Pure copper may be produced by the reaction of copper(I) sulfide with oxygen gas as follows: If 0.330 kg of copper(I) sulfide reacts with excess oxygen, what mass of copper metal may be produced.
A mixture in a container at this temperature has a total pressure of 2.0 atm. The molar percent of N2O4 is 12.0% and NO2 is 88.0%. Calculate the reaction quotient, Qp.
The rate constant for this reaction is 4.8 x 10-3 M-1 days-1 at a given temperature. Suppose you started with 2.6 M of HCN(aq), what would be the molar concentration of HCN(aq) at 20 days?
If a chemical reaction, A + B ---> C + D, is endothermic, what is the sign of ΔH for the reaction? Would the temperature recorded in the calorimeter well for such a reaction increase
Determine the limiting reactant and show your work. How many grams of carbon dioxide will be produced in this reaction?
What is the new pressure, in atm, when the air is placed in tanks that have the following volumes, if there is no change in temperature and amount of gas?
Write a balanced chemical equation for the reaction of 4-Nitrobenzaldehyde and sodium borohydride (NaBH4). If 0.21 g of 4-nitrobenzaldehyde dissolved in 10 mL of methanol is mixed with 0.14 g of so