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If 6.73 g of Na2CO3 is dissolved in enough water to make 250. mL of solution, what is the molarity of the sodium carbonate?
What is the value of the equilibrium constant for the neutralization of acetic acid with sodium hydroxide? The Ka for acetic acid is 1.8 ? 10-5 and the neutralization reaction of interest is CH3CO2H(aq) + NaOH(aq) -> H2O(l) + NaCH3CO2(aq).
oleci acid has following compostions : 76.54%C, 12.13%H, 11.33% O. If the experimental molar mass is 282.g/mol, what is the molecular formula of oleic acid?
If an automobile is able to travel 224 mi on 10.0 gal of gasoline, what is the gas mileage in km/L
At constant volume the temperature of 2.0atm was 325K. The temperature is increased to 400K. What is the new pressure of the gas?
Calculate how many molecules of C 2 H 6 S (ethyl mercaptan )are contained in 1.0 micro liter sample if the given density = 0.84 g/mL
She weighed an empty 4.3 L bulb, then filled it with the gas at 1.60atm and 23.0 C and weighed it again. The difference in mass was 7.9g . Identify the gas.
Calculate the molarity of a solution of HBr if 34.80 mL of the HBr solution neutralize 0.834 g of Na2CO3. The following is the unbalanced equation for the reaction
Calculate the pH of the final solution after 250 mL of a 0.157 mol dm-3 solution of HCl is added to 500 mL of a 0.103 mol dm-3 solution of NaCN (Ka HCN = 6.2 × 10-10).
A 1.0 L solution has a mixture of 0.05 M NaH2PO4 (pKa = 6.86) and 0.10 M Na2HPO4. How much 1.0 M NaOH should be added to bring the solution to pH 7.4?
Explain why the bond dissociation energy for the C-C sigma bond in propane is lower than the BDE for the C-C bond in propene.
A line in the emission spectrum of an atom occurs at a wavelength of 560 nm. What is the energy difference between the two energy levels involved in this emission.
The density of a sodium sulfate solution is 1.07 g/cm3. The solution is 8.00% sodium sulfate by mass. How many cm3 of the solution are needed to supply 4.28 g of sodium sulfate?
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