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A rectangle has an area of 36.38 cm2. When both the length and width of the rectangle are increased by 1.60 cm, Calculate the length of the shorter of the two sides of the initial rectangle
Calculate the change in entropy (in J/K) for the following reaction at 298 K: C(s) + H2O(g) ? CO(g) + H2(g)
Sheena can row a boat at 3.03 mi/h in still water. She needs to cross a river that is 1.10 mi wide with a current flowing at 1.55 mi/h. How long does it take her to cross the river
Balance the following equation using half reactions. Write the half reactions in net ionic form if they occur in aqueous solutions a.
Two small identical conducting spheres are placed with their centers 0.70 m apart. One is given a charge of 1.2 x 10^-8 C, Find the electrostatic force exerted on one sphere by the other
Calculate the change in entropy (in J/K) when a 44.0 g of nitrogen gas is heated at a constant pressure of 1.50 atm from 19.3 ºC to 86.5 ºC.
Calculate the change in entropy (in J/K) when a 67.9 g of water is heated from 14.8 ºC to 74.0 ºC at 1 atm. (The specific heat is 4.184 J/(g-K).)
Calculate ?G (in kJ) at 65 oC for the reaction- N2O(0.0024 atm) + H2(0.24 atm) ? N2(846.0 atm) +H2O(l)
How many hydrogens are in C16H?, which has 3 ring(s) and 8 double bond(s)? How many hydrogens are in C8H?O2, which has 2 ring(s) and 1 double bond(s)
Calculate the pH for each of the following cases in the titration of 50.0 mL of 0.100 M HClO(aq) with 0.100 M KOH(aq). (a) before addition of any KOH
Calculate the pH for each of the following points in the titration of 50.0 mL of a 1.5 M H3PO3(aq) with 1.5 M KOH(aq)
Calculate the pKa value of the acid and determine the number of moles of acid initially present. b) When the reaction is complete, what is the concentration ratio of conjugate base to acid
A 0.160-mole quantity of NiCl2 is added to a liter of 1.20 M NH3 solution. What is the concentration of Ni2 ions at equilibrium. Assume the formation constant* of Ni(NH3)62 is 5.5 × 108.
Which weak acid would be best to use when preparing a buffer solution with a pH of 9.70? An acid with Ka = 3.2 × 10^-5 An acid with Ka = 4.0 × 10^-7 An acid with Ka = 1.3 × 10^-11
Write a balanced equation for the yeast using glucose to produce energy, etanol and carbon dioxide.
What will be the final temperature of the water in an insulated container as the result of passing 4.00g of steam [H2O(g)] at 100.0 Celsius degrees into 100.0g of water at 25.0 Celsius degrees
The nucleus of 8Be, which consists of 4 protons and 4 neutrons, is very unstable and spontaneous breaks into two alpha particles, what is the force between the two alpha particles when they are 7.00
Calculate the difference in the chemical potential of sucrose at 0.01 M and at 0.0001 M concentrations.
Two point charges are on the y axis. A 5.20-µC charge is located at y = 1.25 cm, and a -2-µC charge is located at y = ?1.80 cm. Find the total electric potential at the origin
An early model of the hydrogen atom viewed it as an electron orbiting a proton in a circular path with a radius of 5.29×10?11m. What would be the speed of the electron in this model
What is the estimated value of the Faraday using the values for: a.) the electrode that gains silver? b.) the electrode that loses silver
Find an example of a natural product or drug that has been prepared using a Diels-Alder reaction. Show the complete synthesis of the drug.
Calculate delta H in kilojoules for the reaction, assuming that the heat capacity of the calorimeter is 776J/C , that the specific heat of the final solution is the same as that of water [(4.18 J/(g
The reaction and rate law for the gas-phase decomposition of dinitrogen pentaoxide are 2 N2O5(g) ---> 4 NO2(g) + O2(g), rate = k[N2O5]. Which of the following can be considered a valid mechanism(
The oxidation number of Cr changes during the reaction from ____ to ___. Because of this change, chromium is reduced/oxidized (circle one). The oxidation number of the alcoholic carbon changes from