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A diode laser emits at a wavelength of 987 nm. All of its output energy is absorbed in a detector that measures a total energy of 0.54 J over a period of 36 sec. How many photons per second are being emitted by the laser?
What is the molarity of a solution formed by mixing 20.0 g sulfuric acid with enough water to make 500.0 mL of solution?
The law of definite proportion would predict that a 70.0 g gram sample of chemical X should contain how many grams of nitrogen?
An experiment requires 40.0 of ethylene glycol, a liquid whose density is 1.114 . Rather than weigh the sample on a balance, a chemist chooses to dispense the liquid using a graduated cylinder. What volume of the liquid should he use?
Briefly explain in terms of structure, basicity, and solubility why Novocain® is usually administered by injection whereas benzocaine is typically used in salves.
For the cell diagram T1 and Pt Enter part(a), (c) with 2 siginificant digits and part(b) with 3 siginificant digits. Enter scientific notation as 1.23E4. (a) What is Ecell if the unknown solution in the half-cell on the left has pH = 4.94
A covalent compound is composed of a nitrogen atom, a hydrogen atom, and a carbon atom. How many electrons should the Lewis structure of the covalent compound contain
the activation energy for the following reaction is 60. kjmol.sn2 2co3 rarr sn4 2co2by what factor how many times
At 1045K the partial pressures of an equilibrium mixture of H2O (g), H2 (g), and O2 (g) are .040, .0045, and .0030 respectively. Calculate the value of the equilibrium constant Kp at 1045K
A piece of charcoal from a tree killed by the volcanic eruption that formed the crater in Crater Lake (in Oregon) gave 7.0 disintegrations of carbon-14 nuclei per minute per gram of total carbon.
If 10 g of C react with 115 g of O2 according to the equation C + O2 → CO2, how many g of O2 will remain unreacted?
How many grams of iron are required to make 2.50 L of aqueous solution containing 8.00 % Iron (III) chloride by mass. The density of the solution is 1.067g/mL
Decomposition of KClO3 is sometimes used to prepare small amounts of O2 in the laboratory: 2KClO3(s) 2 KCl(s) + 3 O2(g). How many grams of O2 can be prepared from 4.50 g of KClO3?
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