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Two unknowns, X and Y, both having the molecular formula C4H8O, give the following results with four chemical tests. Propose a structure for Y consistent with this information. Bromine Na metal Chromic acid Lucas reagent Cpd X decolorizes bubbles orange to green no reaction Cpd Y no reaction no reaction no reaction no reaction
Important information about Chem problem, A 25 mL sample of .13M HCl is mixed with 15mL of .24M NaOH. The pH of the resulting solution will be nearest. The answer is 11.9
How many kJ of heat are needed to completely vaporize 1.30 moles of The heat of vaporization for water at the boiling point is 40.6 kJ/mole.
Suppose that the gas in a storage tank exerts a pressure of 55.125 lb/in2 . What is the pressure of the gas in units of torr?
Given the following thermochemical equations, C2H2(g) + 5/2 O2(g) -----> 2CO2(g) + H2O(l) enthalpy = -1299.5 kJ
Given the following equilibrium constants at 427 °C: Na2O(s) 2Na(l) + 1/2 O2(g) Kc = 2 x 10-25 NaO(g) Na(l) + 1/2 O2(g) Kc = 2 x 10-5 Na2O2(s) 2Na(l) + O2(g) Kc = 5 x 10-29 NaO2(s)
When 3.00 g KNO3 are dissolved in 50 g glycerol, the freezing point changes from 17.8°C to 13.6°C. What is the freezing point depression constant (Kf ) for glycerol.
An aqueous solution contains metal cations Hg^+2 and Mn^+2 belonging to groups 2 and 3 respectively. Thioacetamide which produces H2S is added and the solution is buffered to a pH of 8 by addition of NH3/NH4Cl
The following reaction is initiated and the concentrations are measured after ten minutes: A(g) + 3 B(g) AB3(g); Kc = 1.33 x 10-2 [A] = 1.78 M [B] = 2.21 M [AB3] = 1.19 M Is the reaction in equilibrium
What are the values of Ka and pKa for lactic acid? b. Calculate the pH of a .10M HCN solution, which has a Ka = 1.4x10^-9 at 25C. Assume that the dissociation of HCN is negligible compared to its initial concentration.
Write lewis structures for each of the following species. Use expanded octects as necessary.
Two readings (initial volume and final volume) are required to deliver a specified volume of titrant. For a delivered volume of 6.25 mL, compute the uncertainty in the volume of titrant delivered.
Calculate the distances NH3 gas and HCl gas would travel in this experiment if a 100.0-cm tube were used, based on the accepted molar masses for the two gases
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