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A 26.1 g sample of pure iron at 77°C is dropped into 93 g of water at 17°C. What is the final temperature of the water-iron mixture?
The rate constant of a reaction is 4.7 10-3 s-1 at 17°C and the activation energy is 33.6 kJ/mol. What is the value of k at 75°C.
Fumaric acid, which occurs in many plants, contains 41.4% C, 3.47% H, and 55.1% O by mass. A 0.5 mol sample of this compound has a mass of 58.0 g.
Calculate the enthalpy change for the dissolution of NH 4 NO 3 and expree your answer in units of kJ/mol.
how many meters away is a cliff if an echo is heard one half second away? assume that sound ws traveled at 343 m/s on that day.
A compound is found to be 30.45% N and 69.55 % O by mass. If 1.63 g of this compound occupy 389 mL at 0.00°C and 775 mm Hg, what is the molecular formula of the compound.
Consider a lake containing 39 ppb (parts per billion) of parathion, which has a log Kow = 3.8. If a sample of lake water was mixed with octanol, what is the expected concentration of parathion in the octanol?
What is the total sample size (in grams) for a sample of disulfur octoxide which contains 3.52 g of oxygen.
Determine the new pressure of the gas and express your answer in Pa
Some of the cyclohexane solvent vaporized during the temperature versus time measurement. Will this loss of cyclohexane result in its freezing point being recorded as too high, too low, or unaffected.
At 4.00 rm L, an expandable vessel contains 0.864 mol of oxygen gas. How many liters of oxygen gas must be added at constant temperature and pressure if you need a total of 1.96 mol of oxygen gas in the vessel.
Determine the entropy change for freezing 6.33 grams of C 2 H 5 OH at 158.7 K? H =-4600 J/mol. Express your answer in units of J/K.
The heat of neutralization of HCl by NaOH is H°rxn = -56.2 kJ/mol. How much heat is released when 125 mL of 1.750 M HCl is mixed with 195 mL of 0.667 M NaOH.
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