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A mixture of CaCO3 and CaO weighing 0.693 g was heated to produce gaseous CO2. After heating, the remaining solid weighed 0.436 g. Assuming all the CaCO3 broke down to CaO and CO2, calculate the mass percent of CaCO3 in the original mixture.
Understanding of chemistry basics - which of the following is not changed by the activity of an enzyme during a chemical reaction?
Determine the Osmotic Pressure for the following aqueous solutions @ 25 degrees Celsius. (a.) 1.0. M Glucose, and (b.)1.0 M NaCl. Explain which solution has the greater osmotic pressure if any and why.
"A sample of a particular radioisotope is placed near a Geiger counter, which is observed to register 160 counts per minute. Eight hours later the detector counts at a rate of 10 counts per minute. What is the half-life of the material?"
Classify these 3 elements by whether they get oxidized or reduced in the reactions shown here: Calcium Oxygen Flourine Lithium 2Ca (s) + O2 (g)= 2CaO (s) F2 (g)+2Li (s) = 2LiF (s)
How many moles of NaOH must be added to 0.550 L of 0.191 mol/L HC3H5O2(aq) to obtain a solution with pH=4.7. Assume the temperature is 25oC. (For HC3H5O2, pKa=4.89 at 25oC).
A 275-g sample of nickel at 100.0C is placed in 100.0 mL of water at 22.0C. What is the final temperature of the water.
Write the balance equation and predict the moles of ammonia that can be made using usng 22.4g of nitrogen and an unlimited amount of hydrogen
the highly reactive oh radical a species with an unpaired electron is believed to be involved in some atmospheric
how many moles of gas are there in a 45.0 l container at 25.0 degress celcius and 500.0 mm hg
In an experiment where aniline is reacted with acetic anhydride to form acetanilide, how do you calculate the theoretical yield of acetanilide?
Electronic spectroscopy makes transitions between electronic states, as well as vibrational (and rotational) states. Explain why no general vibrational-state selection rule exists for electronic transitions.
the carbon dioxide that is exhaled by astronauts who are on a space shuttle is scrubbed by pumping the air through
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