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Two students determine the percentage of lead in a sample as a laboratory exercise. The true percentage is 22.52%. The students' results for three determinations are as follows:
1. 22.52, 22.48, 22.542. 22.64, 22.58, 22.62
Precision can be judged by examining the average of the deviations from the average value for that data set. Calculate the average value of the absolute deviations of each measurement from the average for the first set.
Calculate the average value of the absolute deviations of each measurement from the average for the second set.
Carbon-14 decays by beta emission with a half life of 5,730 years. Assuming a particular object originally contained 6.5 micro grams of C-14 and now contains 0.76 micro grams of C-14, how old is the object
Determine What is the ? Ssys for the process?(if it is given the specific heat capacity for ethanol is 2.42 J/g K.) express your answer in units of J/K
Calculate the wavelength of the n=4 to n=1 and the n=4 to n=3 transitions. Indicate in which regions of the electromagnetic spectrum these transitions would occur.
A 21.496 g sample of magnesium is burned in air to form magnesium oxide and magnesium nitride. when the products are treated with water, 2.813 g of gaseous ammonia are generated.
Calculate pH change if 1ml of HCl were added to 30.0ml of pure water instead of the buffer solution.
What is the system? What is the surrounding? In what direction does the heat flow? Is the process endothermic or exothermic?
Calculate the quantity of gas, in moles, if 127 L at 55.0 C has a pressure of 11.35 kPa.
Ksp for CaF2 is 3.9E-11 at 25C. Assuming CaF2 dissociates completely after desolving and that there are no other equilibria affecting its solubility calculate the solubility of Caf2 in grams per liter.
Cyclohexane can be used as a solvent for freezing point depression measurements. When 1.07 g of naphthalene (MW = 128.17 g/mol) is mixed with 51.29 g of cyclohexane, the freezing point of the resulting solution is 3.29 °C.
Aluminum foil used for storing food weighs about 0.3g/in2. How many atoms are contained in one square inch of aluminum foil
The elementary reaction 2H20(g) 2H2(g)+O2(g) proceeds at a certain temperature until the partial pressures of H2O, H2, and O2 reach 0.0700 atm, 0.00200 atm, and 0.00600 atm respectively. What is the value of the equilibrium constant at this temper..
1. prior to placing a 5.158 g piece of metal into the graduated cylinder the level was 5.0 ml. after adding the metal
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