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A lightning flash is seen and then 1.9 seconds later the thunderclap is heard. How far away in miles did the lightning strike if sound travels 1087 feet per second and a mile is exactly 5280 feet?
A sample of material contains contains 20 mg of I ^131. Calculate: A) The number of I ^131 atoms initially present. B) The activity in becquerels and curies.
Nitrogen forms several gaseous oxides. One of them has a density of 1.27 g L-1 measured at 764 mmHg and 150C. write the formula of the compound
A mixture is prepared using 25.00 mL of 0.08000 M aniline, 25.00 mL of 0.06000 M sulfanilic acid and 1.00 mL of 1.230 × 10-4 M HIn and then diluting to 100.0mL, where HIn is the protonated indicator. The absorbance measured at 550nm in a 5.000 cm ..
5.00 g of SO2 and 5.00 g of CO2 were placed in a 750.0 mL container at 50.0 °C. What is the partial pressure of CO2 in the container?
Based upon your experiences, suggest what would be the result if we heated a mixture of dichloromethane (bp 39-40 Celcius) and nappthalene (C10H8 with mp 80-82 degrees celcius and bp 218) to 60 degrees celcius
A gaseous mixture containing 0.160 mol fraction of carbon tetrachloride (CCl4) and 0.840 mol fraction of dry air is initially at 57.0°C and 1133 mmHg. If this mixture is cooled at a constant pressure, at what temperature does the CCl4 first start ..
Calculate the energy in joules and calories lost when 18.0 {rm g} gold ({rm Au}) cools from 226^circ C to 124^circ C.
Which of these ions best represents the conjugate acid in a "phosphate" buffer at physiological pH? Explain. H2PO4^-, HPO4^2-, PO4^3-
Which of the alkaline earth metal hydroxides, M(OH)2, would you expect to be most soluble in water? Least soluable?
The pressure on 200 ml of oxygen gas changes from 380 mm hg to 760 mm hg. The temperature does not change. What is the new volume of the oxygen gas?
Compute the difference in pressure between CH4 and an ideal gas if 14.0 moles of gas are in a 6.00 litres tank at the temperature of 21.1 degree celsius . The van der Waals constants for CH4 are a =2.300 L^2 x atm/mol ^2 and b=0.0430 L/mol.
celcius of a solution prepared by dissolving 0.0550 mole of a sodium acetate in 1.00 L of 0.250 M acetic acid.
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