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When N2(g) reacts with O2(g) to form NO2(g) according to the following equation, energy is absorbed from the surroundings.
Is this reaction endothermic or exothermic? _________ermic
What is the sign of ΔH for the reaction? _________(poitive or negative)
Would the energy of the surroundings increase or decrease as a result of this process? _________
titrated Acetic Acid with Sodium Hydroxide. The endpoint measured 27.9 mL. The NaOH concentration was figured out by titration of a primary standard KHP. The resulted concentration was ~.2651 M NaOH
A physiological saline solution contains 164 mEq/L each of Na+ and Cl-.How many moles each of Na+ and Cl- are in 0.500 L of the saline solution.
For the unbalanced equation _Al+_O2=_Al2O3. How many moles are needed to form 2.3 moles of aluminum oxide.
A compound A has prominent infrared absorptions at 1050, 1786, and 1852 cm-1 and shows a single absorption in the proton NMR spectrum
Hydrogen atoms are excited by a laser to the n=4 state and then allowed to emit. What is the maximum number of distinct emission spectral lines that can be observed from this system? Calculate the wavelength of the 4 to 1 transition in m.
r2 deaker and c3 phosphate are titrating 100 ml of monoprotic acid (HAc) with a .5M NaOH solution. the equivalence point was reached after the addition of 15 ml. what is the concentration of the acid in molarity
Choose four salts from the list below as well as indicate whether an aqueous solution of the salt would be expected to be acidic or basic. State an equation for each salt showing how you reached your conclusion.
A graduated cylinder contains 31.0 of water. What is the new water level after 38.0 of silver metal is submerged in the water?
Question- An antacid tablet was dissolved in 100.00mL of 0.300M HCl. 10.00mL of this solution was titrated to endpoint with 22.16mL of 0.0914M NaOH. How much calcium carbonate was in the antacid tablet
How many Kilowatt hours of energy are necessary to heat the air in the room from 7'c to 28'C? The heat capacity of air is 1.03 J/g'C
Explain how many electrons per atom are delocalized in the sea of electrons model for the subsequent metals. a) iron b)vanandium c) silver
Consider the following table of measurements of pressure vs. volume for air in a closed volume at room temperature.
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