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Skiers and group engaged in outdoor activities in a frosty climate can access Portable hot packs. Mixture of powdered iron, NaCl (sodium chloride), and other components, are present in these air-permeable paper packet and all moistened by a little water(H2O). The exothermic reaction (that produces the heat) is a very frequent one-the 4Fe(s)13O2 (g) ¡2Fe2O3(s) rusting of iron that happens at the time When the outside plastic envelope is detached oxygen molecules that are present in the air penetrate the paper, cause the rusting of iron reaction to start. Determine how much heat is formed by this reaction if a typical packet has 250 g of Fe to warm your hands (or feet for up to 4 h) express your answer in kJ?
A volume of 60.0 mL of aqueous potassium hydroxide(KOH)was titrated against a standard solution of sulfuric acid(H2SO4). What was the molarity of the KOH solution if 24.7 mL of 1.50M H2SO4 was needed? The equation is: 2KOH(aq)+H2SO4(aq)-->K2SO4(aq..
Flask a contains h2 at 0 C and 1 atm pressure. Flask b contains co2 gas at 25 C and 2 atm pressure. compare these following
ethanol vapor at 0.5 bar and 78 degrees celcius is compressed isothermally to 2 bar in a reversible process in a closed system a) draw a qualitative PV graph and show the path of the process.
In the manufacturing of computer chips cylinders of silicon are cut into thin wafers that are 3.00 inches in diameter and have a mass of 1.50 g of silicon
From the time the mass of the flask is first measured until the time it is finally measured, it is handled a number of times with oily fingers. Does this lack of proper technique result in the molar mass of the vapor in the flask being reported as..
How many air molecules are in a 12.5x12.0x10 room? Assume atmospheric pressure of 1.00 , a room temperature of 20.0 , and ideal behavior. Volume conversion:There are 28.2 liters in one cubic foot.
soultion of silver nitrate is mixed with 400.0 ml of 0.200 M calcium chloride. What is the concentration of cl- in solution after the reaction is complete
how many liters of fluoridated drinking water would a 70 kg person have to consume in one day to reach this toxic level? How many kg of sodium floride would be needed to treat a 7.49x10^6 -gal reservior?
Calculate the amount of energy in the form of heat that is produced when a volume of 4.70 L of SO2 (g) is converted to 4.70 L of SO3 (g) according to this process at a constant pressure and a temperature of 1.00 bar and 25 degree celsius.
What is the molar concentration of methanol in the mixture? Give answer in M, 2 significant digits, do not write down the units.
calcium carbonate reacts with hydrochloric acid to forma a salt carbon dioxide and water. write the balanced equation
What total volume of chloroform would be required to remove 99% of the cocaine from 100 mL of water in three successive extractions?
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