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An unknown sample of metal with a mass of 30.0 grams absorbed 520 joules of energy. The temperature of the metal increased from 25.0°C to 70.0°C. Calculate the specific heat of the metal. What is the identity of the metal?
A 16.0 ounce specially drink contains 349 mg caffeine. what is the concentration of caffeine in this solution? one fluid ounce is equivalent to 29.57ml. the formula for caffeine is c8H10N4O2
Given the heat of combustion for the following reactions, determine the enthalpy of formation for pentane, C5H12.
In an experiment, the student placed a test tube containing a pink equilibrium mixture on a hot plate. The solution began to boil and turned blue. A second test tube with the same pink equilibrium mixture was placed in an ice bath. The solution tu..
estimate the volume of 5 M NaOH must be added to adjust the pH from 4 to 9 solution of 100mL 100mM phosphoric acid
Describe two independent methods for determining the atomic mass of an element. Explain how these method are truly independent.
Urea (NH2)2CO is prepared by reacting ammonia with carbon dioxide. The byproduct is water. 637.2g of ammonia are reacted with 787.3 g of carbon dioxide. Which of the two reactant is a limiting reactant
the three naturally occurring isotopic forms of k are 39k 38.963707u 40k 39.363999 u and 41k. the percentage natural
The first three reactions of the b oxidation pathway are similar to three reactions in the Kreb's cycle. Which three and why are they similar
25 mL of an unknown Ba(OH)2 solution require 20 mL of a .150M HCl solution to neutralize it: Ba(OH)2 (aq)+ 2HCl (aq) -> 2H2O (l) + BaCl2 (aq) 1) How many moles of HCl were used in the titration?
Calculate Kp at this temperature. b. Would an increase or decrease in temperature lead to the production of more ammonia c. List two other things you could alter experimentally to increase the amount of ammonia (note: don't use the same effect and..
In the equation HSO4- + H2O SO4-2 + H3O+, if the Ka is 1.5 x 10 ^-2 and HSO4- = 1.0 M at equilibrium, what is the pH of this solution?
compare the length of a column of mercury to that of a column of water required to produce a pressure of 1.0 bar. the densities of mercury and water at 0C are 13.459g/cm^3 and .99987g/cm^3
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