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A sample of nitrogen gas in a 4.6-Lcontainer at a temperature of 25°Cexerts a pressure of 3.7 atm. Calculate the number of moles of gas in the sample.
Elemental sulfur occurs as octatomic molecules, S8. What mass of fluorine gas is needed to react completely with 18.7 g of sulfur to form sulfur hexafluoride?
Phosphate ons are a major pollurant of water supplies. They can be removed by precipitation using solutions of Ca2-ions becasue the Ksp of calcium phosphate is 2.0 x10-29 .
How many unpaired electrons does gadolinium have and which orbitals arethey in? Provide the electron configuration as part of your answer.
The specific heat capacity of silver is 0.24 J/oCg. It takes 1.25 kJ of heat energy to raise the temperature of sample of silver from 12.0 oC to 15.2 oC.Calculate the mass of the sample of s
A drop of Methyl Orange was added. For this indicator the solution will be Red in high concentration ofH3O+ , and solution will turn yellow in high concentration of H3O+
What is the Ksp for lithium tetraborate if 50.0 mL of saturated solution of lithium tetraborate requires 9.11 mL or 0.511M HCL totitrate the tetraborate ion?
In a neutralization experiment 35 ml of 1.0M ofHNO3 was mixed with 50 ml of 1.0M of NAOH. How many moles of nitric acid was neutralized?
A combination of Magnesium atom and Oxygen atom results to Magnesium oxide, with the chemical formula MgO. What is the name for a combination of Magnesium and Nitrogen?
If an archaeologist finds anancient firepit containing partially consumed firewood, and the14C content of the wood is only 22.5% that of an equal carbon sample from a present-day tree, what is the age
What mass of sodium fluoride must be added to 250. ml of a0.100 M HF solution to give a buffer solution having a pH of 3.50 ?ka(HF) =7.1 x 10^-4
Calculate the value of the reaction quotient, Qp, at 25C for this reaction when the pressure of nitrogen is 2.9atm, the pressure of hydrogen is 1.3atm, and the pressure of ammonia is .70atm.N2
Hydrogen iodide decomposes according to the equation 2HI (g) -- > H2(g) =I2(g) for which the Kc is .0156 at 400 degrees C. .550 mol HI was injected into a 2.00L reaction vessel at 400 degrees C.
If the energy from the manufacture of6.7 billion kg of nitric acid produced in 2004 were recovered and used residentially, how many households could be powered for a month by that much energy?
The activation energy of a certain reaction is 76.7 kJ/mol. How many times faster will the reaction occur at 61°C than at -5°C?
Ammonia (NH3) reacts with oxygen to give NO and water. How many O2 molecules are required to react with 68 grams of ammonia?
A solution contains 0.050 M Ba2+ and 0.050 MCa2+. A solution containing fluoride ions is added to selectively precipitate one of the ions. At what concentration offluoride ions will a precipit
A solution contains 0.021 M Ba2+ and 0.017 MCa2+. A solution containing fluoride ions is addedto selectively precipitate one of the ions. At what concentration of fluoride ions will a precipit
At 1400 mm Hg and 286 K a diver exhales a 208 mL bubble of airthat is 77% N2 , 17% O2, and 6%CO2 by volume. How many milliliters would the volume of the bubble be at the surface and 298 K an
Mineral oil can be used in place of mercury in manometers when small pressure changes are to be measured. What is the pressure ofan oxygen sample in mm of mineral oil if its pressure is 28.5 mmHg? (
The human eye can percieve green light of wavelength 550 nm whenthe rate of incidence of radiation is 2.0 x 10-16J/s. Calculate the number of photons of green light of 550 nm wavelength that must fa
Calculate the enthalpy of formation for butane,C4H10 using the balanced chemical equation and write out the solution according to Hess's law.
Discuss in detail the healthcare applications of chemical reactions. Which chemical reactions would you consider tobe of importance to healthcare professionals? Why? In which situations are these ch
Calculate the concentrations of the dinitrophenylamines in the solutions used for the spectrophotometry infinityreading. If you know the path length of the curvette you used, calculate the molar abs
Explain why the reaction of 2,4-dinitrochlorobenzene with piperidine or morpholine is second order, even though there are three reactant molecules in the overall equation for the reaction.