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Explain why gas chromatography usually ramp(increase) the oven temperature during an analysis?
what is the grams of 9.31 x 10^24 molecules of methanol (CH3OH)? combining 0.357 mol of Fe2O3 with excess carbon produced 19.2g of Fe ; Fe2O3 + 3C ---> 2Fe + 3CO what is the actual yield of iron?
Do carboxylic acids react with ylids. If not, why would it be bad to have carboxylic acid present during a reaction between benzaldehyde and a ylid
calculate the freezing point and boiling point of an aqueous solution that is .040 molality in na3po4. assume that the
What are the concentrations of OH- and H in a 0.00067 M solution of Ba(OH)2 at 25 °C? Assume complete dissociation.
NH3 is a weak base (Kb = 1.8 × 10-5) and so the salt NH4Cl acts as a weak acid. What is the pH of a solution that is 0.080 M in NH4Cl
how many grams of NO are required to produce 145 g of N2 in the following reaction? 4NH3+6NO-- 5N2+6H2O
What is the half-life of a compound if 76 percent of a given sample of the compound decomposes in 43 min? Assume first-order kinetics.
Half-life equation for first-order reactions: (the 1/2 in t1/2 is a subscript) t1/2=0.693/k where t1/2 is the half-life in seconds (s) , and k is the rate constant in inverse seconds (s^-1).
Calculate the change in enthalpy of this reaction. Specific heat of the solution = 4.184 J/(g oC) State your answer in kJ with 3 significant figures. Don't forget to enter the unit behind the numerical answer. The molecular weight of KOH is 56.2 g..
Acetylsalicylic acid (aspirin), HC9H7O4, is the most widely used pain reliever and fever reducer in the world. Find the pH of 0.045 M aqueous aspirin at body temperature (Ka at 37°C = 3.6 10-4)
Assume that the partition coefficient, K, for partitoning of compound A between diethyl ether and water is 3; that is, A preferentially partitions into ether.
Given the following thermodynamic data, calculate the lattice energy of CaBr2 (s). Term & Value Delta Hf[Ca(g)] 179; delta Hf[Ba(g)] 112; I1(Ca) 590; I2(Ca) 1145; E(Br) -325.
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