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Problem- An 61.32 g sample of aluminum is placed on a 60.29 g sample of copper initially at 96.9oC. If the heat is only transferred between the metals (with no loss to the surroundings) and the final temperature of both metals is 40.77oC, what is the initial temperature (in oC) of aluminum?
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The volume of a drop of rain was found to be 0.448 ml at N.T.P. How many molecules of water and number of atoms of hydrogen are present in this drop.
Given that the 50.0 mL of 0.12 M weak acid is titrated with 0.20 M NaOH and Ka = 1.8x10-5, calculate the predicted volume of base (Vb) needed to be added to achieve a pH of 7.00.
A sample of pure oxalic acid hydrate was obtained by extracting a plant called Snake Tongue. A 3.000 g sample of the materials heated carefully in a vacuum oven until no more mass was lost from the sample.
The Cl- is at equilibrium across the membrane while the protein is inside the cell and cannot permeate the membrane. Determine the concentration of Pr+/- (in M)?
Draw the skeletal structure for the major organic product formed when 1-butyne reacts with 2 equivalents of HBr
Determine the molecular weight of a compound given the gas phase data: mass of 11.8 g, temperature of 39.1 C, pressure of 630 torr, volume of 1.31 L.
calculate the change internal energy (E) for a system that is giving off 45.0kJ of heat and is performing 855J of work on the surroundings.
Solid lithium hydroxide is used in space vehicles to remove the carbon dioxide gas exhaled by astronauts. The hydroxide reacts with the carbon dioxide to form solid lithium carbonate and liquid water.
Explain why is the major product between p-anisaldehyde and acetophenone the crossed aldol product rather than the Cannizzaro reaction or the self-condensation of acetophenone
Given the parent compound, draw the mass spectrum fragment that is observed at m/z 77. Include any hydrogen atoms and the charge.
The precipitate, after having been filtered and air-dried, has a mass of .284 g. The limiting reactant in the salt mixture was later determined to be CaCl2x2H2O.
Suppose you have a sample of sodium weighing 11.42 g. How many atoms of sodium are present in the sample.
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