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The complete combustion of a substance containing carbon andhydrogen requires 1 mole of oxygen for each mole of carbon and 1mole of oxygen for every two moles of hydrogen to form the productsCO2 and
What is the minimum weight, in grams, ofthis compound that must be added to 8 kg of water to produce asolution that will protect an automobile cooling system fromfreezing at -20°F (-28.9°C)?
"Hard water" is caused by the presence of dissolved salts. One ofthe main components is CaCO3. When hard waterevaporates, the solid salt residue is left behind.
The average molecular weight of a sample of PETE is found to be 192,000. How many of the repeating units are in the polymer?
Methanol is burned as fuel, this makes it clear that the reaction is spontaneous once methanol is ignited. yet the entropy change for the reaction 2CH3OH(l) + 3)2(g)---2CO2(g) + 4H2O(l) is negative.
The average human body contains 6.50 L of blood with a Fe^{2+} concentration of 1.60×10-5 M. If a person ingests 7.00 mL of 17.0 m M NaCN, what percentage of iron(II) in the blood would be seq
Calculate the amount of heat liberated (in kJ) from 295 g of mercury when it cools from 82.0°C to 12.0°C. The specific heat of Hg is 0.139 J/ gºC.
How do you calculate the percent yield of ethanol from 80% proof assuming that all the alcohol is collectedin 75 ml of distillate and that the %(m/v)= 0.80 x%(v/v).
When the system reaches equilibrium, a potential differenceof 82.9 mV is measured between the inside and the outside of thecell, where the inside has the higher (more positive) potential.
Consider a solvent whose molecular weight is 100.0 amu and whosevapor pressure at 25°C is 25.00 mm Hg. 100.0 g of a solutewhose molecular weight is 50.00 amu is dissolved in 1.000 kg ofthat solv
On Aug. 6th1945 the United States bombedthe Japanese City of Hiroshima with a 235Uranium based bomb killingsome 140,000 people. It contained 64 kg of uranium (assume ofpure 235U)
Which two packaging plastics should show IR absorptions due toa benzene ring, and which one is the addition polymer,and which one is the condensation polymer?
A 3 cubic meter tank contains 1.5 kg of a gas at 27oC and avacuum pressure of 81 kPa. What is the density and specificvolume of this gas?
Which of the packaging plastics contain oxygen double bonded to a carbon atom, and what characteristic infrared absorption will this plastic display?
Draw the Lewis Dot Structures for ammonia and for the ammonium ion. Write the net ionic equation for the conversion of ammonia to ammonium ion in water. Explain how this is an example of acid-base
The specific heat capacity of liquid mercury is 0.14J/g-K. How many joules of heat are needed to raise the temperature of 5.00 gmercury from 15 ºC to 36.5 ºC?
A certain element has three isotopes. The isotopic masses (amu) and abundances in ( ) are: 159.37 (30.60%), 162.79 (15.79%), and 163.92 (53.61%).
A peroxidase enzyme isolated from human red blood cells was found to contain 0.29% selenium. What is the minimum molar mass of the enzyme?
A small amount of the solid MgSO4 * 7H2O is put in a crucible. The solid is gently heated by a bunsen burner until all the waters of hydration are driven off.
What amount of solid NaOH must be added to 1.0 L of a .15 M H2CO3 solution to produce a solution with [H+] = 3.5x10^-11 M? There is no significant volume change as a result of the addition of the s
A buffer is made up of 355 mL each of 0.200 M NaHCO3 and0.134 M Na2CO3. Enough water is added to thebuffer to make the total volume 10.0 L. Calculate the pH of the buffer after the addition of 0.030
A sample oxygen is collected over water and has a volume of7.84 ml. The pressure od the collected "wet" gas is 71.8 KPa andthe temperature is 20°C.
450 ml of helium whose temperature is 25°C and whosepressure is 850 torr is mixed with 600 ml of oxygen whose temperature is 22°C and whose pressure is 933 torr and the gasmixture is transfe
"Glycemic index" is a popular, though controversial measurementof how quickly glucose is released from starchy foods into the blood during digestion.
Phenol, C6H5OH, is a weak organic acid.Suppose 0.515g of the compound is dissolved in exactly 125 mL ofwater. The resulting solution is titrated with 0.123 M of NaOH.