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charles flew the balloon for fifteen miles and stayed in the air for a total flight time of 45 mins. the balloon was made of silk coated with a thin layer of natural rubber and had a diameter of 27ft. he generated the hydrogen gas needed to lift the balloon by mixing a large amount of iron with aqueous sulfuric acid. if he used 1000 lbs. of iron and excess sulfuric acid, how many liters of hydrogen gas were made?
Calculate the final temperature that results when a 13.0 -g sample of water at 23.1C absorbs 870 J of heat.
The specific heat capacity of solid copper metal is 0.385 J/g-K. How many joules of heat are needed to raise the temperature of a 1.55-kg block of copper from 33.0C to 77.5C?
A flask contains 0.120 mol of liquid bromine, rm Br_2. Determine the number of bromine molecules present in the flask.
What are the protons and neutrons that are emitted from a helium atom called? Atomic mass is expressed in atm.
How many grams of sulfur (S) are needed to react completely with 355g of mercury (Hg) to form HgS?
For a particular redox reaction Cr is oxidized to CrO42- and Cu2 is reduced to Cu . Complete and balance the equation for this reaction in basic solution.
Write net ionic equations for the following molecular equations. HBr is a strong electrolyte. (Include states-of-matter under SATP conditions in your answer. Use the lowest possible coefficients.)
If 19.2 g of CO2 is produced in the reaction of C2H2 with O2 to form CO2 and H2O, how many grams of H2O are produced in this reaction.
Free radicals are also important in many environmentally significant reactions. For example, photochemical smog, which forms as a result of the action of sunlight on air pollutants, is formed in part by the following two steps.
"Alpha" iron metal crystallizes with the body-centered cubic unit cell. If the unit cell is 287 pm on each side, what is the density of alpha iron?
What is the pH of the solution if [OH-] of an ammonia solution is 1.0 X 10-2M?
What is the wavelength of light whose energy is 1000.4 J?
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