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In an experiment, a student gently heated a hydrated copper compound to remove the water of hydration. The following data was recorded:
1. Mass of crucible, cover, and contents before heating-23.54g2. Mass of empty crucible and cover-18.82g3. Mass of crucible, cover, and contents after heating to constant mass-20.94g
Calculate the experimental percent of water in the compound.
Given the following data table of average bond enthalpies, estimate the ΔH^rxn for the reactions 2H2+O2-- 2H2O. What is the hybridization of xenon in each of your Lewis resonance structures?
A 255-mL flask contains pure helium at a pressure of 745 torr. A second flask with a volume of 455 mL contains pure argon at a pressure of 725 torr.If the two flasks are connected through a stopcock and the stopcock is opened, what is the partial ..
Calculate the concentration of an oxalic acid (H2C2O4) solution when 48.1 mL of water is added to 18.2 mL of a 1.78 M oxalic acid solution
write a general equation that illustrates all acid-base reactions. using equation, what factor can be varied to observe their effect on HEAT
How many lone pairs of electrons are there in a molecule of crotononitrile?
When the mixture is ignited, gases are produced and 815 J of energy is released. To what volume will the gases expand against a constant pressure of 635 mmHg, if all the energy released is converted to work to push the piston?
How do I calculate Apparent volume of dry sand and Actual volume occupied by sand particles Using the data below? Also need to know how to calculate the density of sand(based on apparent volume) Mass of graduated cylinder + Table Sand = 26.1g Mass..
The initial mass of the the crude ether was 141 mg. The mass after recrystallization was 121 mg. Calculate the percent recovery from recrystallization.
If the partial pressures of CO2 and H2O in exhaled air are each 27.0 torr at 30.6°C, calculate the masses of CO2 and of H2O exhaled in 1.00 hour of sleep.
A student found that a brand B tablet would neutralize 0.011 moles of HCl per tablet. Which is the better buy, brand A or brand B? Why?
Tartaric Acid is a diprotic acid with ka1=1.0*10^-3 and ka^2=4.6*10^-5. Calculate the concentration of tartarate ion, C4H4O62-, present in 0.015 M aqueous H2C4H4O6 soultion
Ethanol melts at -114 C and boils at 78 C. The enthalpy of fusion of ethanol is 5.02 kJ/mol, and its enthalpy of vaporization is 38.56 kJ/mol. The specific heats of solid and liquid ethanol are 0.97 J/g.K and 2.3 J/g.K, respectively.
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