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A student heated a hydrated sample with an initial mass of 5.726 g. After the heating, the student found that the mass lost by the sample was 2.815 g. What was the percent water in the original hydrated sample?
What is a "crumple zone"? What is their purpose, and why do they increase safety during a crash? Refer to specific physics concepts.
A piece of gold foil has a volume of 0.645cm^3. If the piece of gold measure 10.0 cm by 12.5cm, what is the thickness of the foil
What would be the effect of increasing the temperature on the following reaction? C2H2(g) + H2O(g) CH3CHO(g) DHrxn = -15 1 kJ 1. [CH3CHO] would increase 2. [CH3CHO] would decrease 3. [CH3CHO] would stay the same
1500 g of frozen water at 0 degrees celsius and the temperature of the water at the end was 32 degrees celcius. how many calories of heat energy were absorbed.
The enthalpy of fusion of methanol (CH3OH) is 3.16 kJ/mol. How much heat would be absorbed or released upon freezing 25.6 grams of methanol?
a 27.7 ml sample of CO2 was collected over water at 25.0 degrees celcius and 1.00 atm.(the vapor pressure of water at 25.0 degrees celcius is 23.8 torr) What will the volume be at the same temperature and pressure after removing the water vapor?
suppose you decide to define your own temperature scale using the freezing point -11.5 c and boiling point 197.6 c of
Description of physical chemistry, Find delta Smix, delta Gmix, delta Hmix, and delta Vmix if 125 g of benzene and 25 g of naphthalene are mixed at 60 degrees C.
You discharge the capacitor through a 4.01-O resistor. What is the time constant? After what multiple of the time constant does the potential difference reach?
What are the similarities between the Rutherford-Bohr atom and the modern quantum mechanical model? What are the differences? Why is the Rutherford-Bohr model still useful? In what situations would you use one model over the other? Why?
The absorbance of the reference and the sample solutions match when the pathlength is 2.10 cm. What is the concentration of iron in the well water? For each solution, the zero is set with a blank.
How many grams of aluminum hydroxide are obtained from 18.2g of aluminum sulfide?
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