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Halogenated compounds are mainly easy to identify by their mass spectra because chlorine as well as bromine occur naturally as mixtures of two abundant isotopes. Chlorine takes place as 35Cl (75.8%) and 37Cl (24.2%); bromine occurs as79Br (50.7%) and 81Br (49.3%).
For the compound Dichloromethane or methylene chloride, CH2Cl2:
Explain at what masses do the molecular ions occur?
Explain what are the percentages of each molecular ion?
When 0.100g of graphite is burned completely in a bomb calorimeter(heat capacity =3.344kJ/?C), containing 3000 g of water, a temperature rise of 0.21?C is observed.
supposed the theoritical yield in a reaction is 68.8g, and the percent yield is 66.0%. What is the actual yield of product obtained?
Determine the pH at the point in which the acetate ion concetration equals the acetic acid concentration. (that is where the acetic acid is 50% ionized)
Suppose that the microwave radiation has a wavelength of 12.7 cm. How many photons are required to heat 200. mL of coffee from 25°C to 62°C?
Write lewis structure for these species, including all resonance forms, and show formal charges: CH2NO2- The formal charge of N=1 and the formal charge of O=-2.
a system at equilibrium or striving to reach equilibrium responds in a way that best ac- commodates or reduces any
112 mL of a glucose (C6H12O6) solution is prepared by diluting 8.2 mL of a stock solution of unknown concentration. If the dilute solution contains 0.20 moles of glucose
How many grams of dipotassium phthalate must be added to 750 ml of 0.5 M phthalic acid to give a buffer of pH 5.75
Which one of the following compounds will increase its solubility if the pH of a saturated solution of the compound is lowered
Enough of a monoprotic acid is dissolved in water to produce a 0.0197 M solution. The PH of the resulting solution is 6.41. Calculate the Ka for the acid.
34.62 mL sample of .1510 molar NaOH was needed to completely neutralize 50 mL of an H2SO4 solution. what is the concentration of the origional sulfuric acid solution?
Write the schematic shorthand notation chemists use to represent electrochemical cells for a cell where the anode consists of solid copper immersed in a 0.0100-M solution of copper (II) nitrate and cathode consists of solid silver immersed
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