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50.0000 g of a compound showed that it contained 12.7520 g C,3.2105 g H, and 34.037 g S. The molecular weight of this compound was determined in a seperate expierment and found to be 94.19u. The empirical formula of this compound is:
A typical calibration curve for emission spectroscope(such as ICP or fluorescence) is linear at low analyte concentrations, when the x-axis is concentrations and the Y-axis is detector response. the detector response is directly proportional to th..
How many grams of H3PO4 are in 175 mL of a 3.5 M solution of H3PO4?
Nitrogen-13 is used in tracers injected into the bloodstream for positron emission tomography (PET). The half-life of nitrogen-13 is 10.0 minutes. How much time is required for the activity of a sample of nitrogen-13 to fall to 14.2 percent of its..
The total concentration of butyric acid (TOTBt) in a water sample is 1,000 mg/L as HBt and the pH = 5.5. What is the concentration of HBt in this water in mg/L? The following may be useful in solving this problem: HBt ? H+ + Bt- pKa = 4.82
A 1.17-g sample of a mixture of cyclohexane (C6H12) and naphthalene (C10H8) is dissolved in 17.9 g of benzene (C6H6). The freezing point of the solution is 2.2°C. Calculate the mass percent of the mixture.
0.100 moles of benzoic acid and 0.100 moles of sodium benzoate are added to 1.000 liter of water. What is the final pH
A buffer solution is prepared by mixing 20.0 mL of 0.032 M benzoic acid C6H5COOH(aq) solution with 25.0 mL of 0.022 M NaC6H5COO(aq). What is the pH of the buffer produced? (Ka of benzoic acid = 6.2x10^-5).
platinum crystallizes with a face-centered cubic unit cell. the radius of a platinum atom is 139 pm. calculate the
The standard enthalpy of formation of Zn^2+ (aq) is -153.9kJ/mole. How much heat is evolved when 0.3724 g of Zn(s) reacts with excess hydrochloric acid
Suppose that you are performing an extraction of an aqueous solution with an organic solvent that has a density less than water. propose a method to identify and collect only the organic solvent. assume that water and you solvent of interest are n..
What is the boiling point (in ?C) of each of the solutions below? For water, Kb = 0.51(?C ? kg)/mol. The vapor pressure of water at 45.0?C is 71.93mm Hg.
In an electrolysis experiment such as the one you will perform, 1.76 x 10^-3 moles of hydrogen gas were collected, and the metal electrode lost 0.1983 g. The equivalent mass of the metal is approximately what?
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