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Calculate the number of joules of heat required to change 85.0 grams of water at 25 degrees C to steam at 100 degrees C (heat of vaporization of water = 2260 J/g and specific heat of water = 4.18 J/g C)
the molecular orbital theory provide an explanation for the existence of the covalent molecule Na2 in the gaseous state. How would you predict Na2 by the Lewis theory?
If 3.25ml of vinegar needs 40.0 of 0.130M NaOh to reach the equivalence point in a titration, how many grams of acetic acid are in a 1.30qt sample of this vinegar.
What mass of CCl2F2 must evaporate in order to freeze 115 g of water initially at 21 C? (The heat of fusion of water is 334 J/g the specific heat of water is 4.18 J/g *K .)
Among the electrolytes Na2SO4, CaCl2, Al2(SO4)3 and NH4Cl, the most effective coagulating agent for Sb2S3 sol is
Provide a structure for the following compound: EI mass spectrum: two molecular ions of about equal intensity at m/z = 180 and 182; IR: 1740 cm-1; 1H NMR: ? 1.30 (3H, t J = 7 Hz); ? 1.80 (3H, d, J = 7 Hz); ? 4.23 (2H, q, J = 7
Calculate the mole fraction of the salt in the solution.
How can you tell that Cobalt(II) iodide is a binary ionic compound formed by a transition metal with more than one ionic charge?
which of the solutions included in this experiment could be used to distinguish between the pairs of solutions. In each case, describe the observations you would make and write a net ionic equation for any reaction that would occur.
The standard change in gibbs free energy= -69.0 kJ/mol. What is the change in G for this reaction at 298K when the partial pressures are PNO=0.100 P02=0.350 PN02=0.700 atm
What kinetic energy must the electrons have in order to resolve a protein molecule that is 4.60 nm in diameter. Take the mass of an electron to be 9.11× 10-31 kg.
Solve an equilibrium problem (using an ICE table) to calculate the of each of the following solutions. 1) 0.12 M HF pH = ? 2) a mixture that is 0.12 M in HF and 0.12 M in NaF Explain And show work please
what is the degree of purification (fold purification). what is the percent yield of the enzyme recovered in the purified fraction
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