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Chlorine-36 is a B emitter, with a half-life of 3.0 x 10^5 years. There are 8.4 x 10^8 B particles emitted in 1.9min from a 6.0 mg sample of Cl-36. How many curies of radiation does the 6.0 mg sample represent?
NaOH (aq) are required to neutralize 25.0 mL of HCl (aq). Calculate the concentration of the hydrochloric acid solution.
Is it true that an HCl/NaCl mixture will act as a more effective buffer than a mixture of CH3COOH & CH3COONa
Predict the proton NMR spectrum expected for CH3CHBrCH3. Indicate the proton responsible for the observed peak. Sketch the spectrum.
The solubility of lead (II) sulfate is 4.0x10^-2 g/L. What is the solubility product constant for lead (II) sulfate?
The reaction of 2.30g N2 with excess H2 produces 2.00g NH3. The percent yield of this reaaction is?
Why must we the wavelength bet set to 447nm when the FeSCN2+ solution is an orange-brown colour
Assume ^35^Cl_2_ is a harmonic oscillator( it is slightly anharmonic). If K=329 N/m compute the zero-point energy for this molecule. ^35^Cl= 34.9688g/mol.
Hydrogen gas, H2(g), reacts with iodine gas, I2(g), to form HI(g) by the following proposed reaction mechanism with the listed hypothetical activation energies
KHC8H4O4, was prepared by dissolving 0.4877 g of potassium hydrogen phthalate in about 50 mL of water. Titration with a KOH solution required 18.81 mL to reach a phenolphthalein end point. What is the molarity of the KOH solution
there are three compounds are given as i. pentane ii. 2-methylbutane iii. 23-dimethylbutane iv. 22-dimethylpropane
Write the total and net ionic equations for the reaction of BaSO4 dissociation, and calculate the trial Ksp for the product formed, when 40 mL of 0.1 M Ba(CH3COO)2 reacts with 60 mL 0.6 M MgSO4 and decide whether a ppt will form
the water pressure compressed the balloon and reduced its volume. When the pressure had increased to 55.0 atm, what was the volume of the sample? Assume that the temperature was held constant.
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