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A scientist has a sample of gas that was collected several days earlier. The sample has a volume of 392 cm3 at a pressure of 0.987 atm and a temperature of 21°C. On the day the gas was collected, the temperature was 13°C and the pressure was 0.992 atm. What volume did the gas have on the day it was collected?
The iron (55.847 g/mol) in a 700.0 mL sample of a natural water was determined by precipitation of the cation as hydrated Fe2O3. The precipitate was filtered
calculate the amount of heat in joules (q) required to affect this temperature change and the total change in internal energy, ?U. Note that some books use ?E as the symbol for internal energy instead of ?U.
Calculate the standard enthalpy of formation of liquid water (H2O) using the following thermochemical information
For a zero order process, mathematically derive the first half-life equation involving the evaporation of fingerprints organics from the scene of a crime.
bathed by an atmosphere of nitrogen at 77K and 1 bar? Assume every nitrogen molecule that strikes the surface sticks and that a nitrogen molecule covers an area of 1.1e^5 pm^2.
if 2.67 mL of 0.205 M KOH is required to completely neutralize 25.0mL of a CH3COOH solution, what is the molarity of the acetic acid solution?
A water sample is measured to have alkalinity of 130 mg/L as CaCO3 at pH=9.2, what are the concentrations of the three carbonate species
Tincture of iodine is I2 dissolved in ethanol, C2H5OH. A 1% solution of tincture of iodine is 10.0g of solute for 1000. g of solution. How many grams of solvent are present in 1000. g of this solution? How many moles of solute are in 10.0g of I2? ..
Calculate the solubility of N2 in water at 25 oC in moles/L if the partial pressure of N2 in the headspace above a water sample is 1.65 atm
A piece of Iron weighing 85.690 g was burned in the air. The mass of the iron oxide produced was 118.350 g. What are the moles of iron in the original sample. What is the mass of oxygen in the iron oxide. What is the moles of oxygen in the iron ox..
Derive the fractional compositions for monoprotic and diprotic systems showing the steps as clear as possible including a brief description of a fraction compostion plot.
Write a balanced thermochemical equation for the reaction with an energy term in kJ as part of the equation.
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