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the world's estimated annual gas reserves in 2006 were 6124 trillion ft3 .The world rate of annual use was 105.5 trillion feet3. How long these reserves will last if the rate of use continues?
A zero-order reaction has a constant rate of 3.50×10-4 M/rm s. If after 65.0 seconds the concentration has dropped to 1.00×10-2 M, what was the initial concentration?
How much heat is absorbed by 15.5g of water when its temperature is increased 20.0C to 50.0C?The specific heat of water is 4.184J/(g.C)
How much heat (in kJ ) is required to warm 13.0 of ice, initially at -13.0, to steam at 114.0? The heat capacity of ice is 2.09 and that of steam is 2.01
The heat of fusion of water is 335 J/g. How much heat would be required to melt 47.5 g of ice?
Consider the reaction: C2H5OH (l) + 3O2 (g) --> 2 CO2 (g) + 3 H2O (l) , ?H= -1.37 x 103 kJ When a 24.8-g sample of ethyl alcohol (molar mass = 46.07 g/mol) is burned, how much energy is released as heat?
Calculate the mass of silver chloride in grams required to make 5.6 grams of silver plating?
What mass of ethanol, C2H5OH a nonelectrolyte, must be added to 10.0 L of water to give a solution that freezes at -10.0C? Assume the density of water is 1.0 g/mL. Kf of water is 1.86C/m.
Our quality control department is being moved to a different location and will not be able to handle any projects for a few weeks.
do not specify stereochemistry. (The absolute stereochemical configurations of chiral substances cannot be determined from the data.)
A piece of copper with a mass of 218 grams has a heat capacity of 83.9 J/degrees C. What is the specific heat of copper.
Working with ideal gas law, The pressure of a sample of gas at a constant temperature of 25 degrees C is increased from 1.0atm to 1.3atm
How many liters of softened water, containing a sodium concentration of 5.8×10^-2% sodium by mass, have to be consumed to exceed the FDA recommendation (less than 2.4 g sodium per day)? (Assume a water density of 1.0 g/mL.)
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