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A sample of chalk contained as impurity a form of clay which loses 14.5 % of its weight of water on prolong heating. 5 g of chalk on heating shows in weight , due to evolution of CO2 and H20 by 1.507 g . calculate % of chalk in the sample.
How many milliliters of a stock solution of 10.8 M HNO3 would you have to use to prepare 0.500 L of 0.410 HNO3? Unit of the answer should be in mL.
Someday, cars may be powered by clean H2/O2 fuel cells and electric motors. Under standard conditions, such a fuel cell can develop 1.229 volts. If the oxygen is obtained from air (at P=0.21 bar), what pressure of H2 would be required to develop 1..
Our stock solutions are 0.2M EDTA, 0.04 M NaF and 1.2 M potassium phosphate. What volumes of the stock solutions should be measured?
The boiling point of HCl is -84C and that of HBr is -70C. Why is this reasonable on one account however opposite from what one would expect from a consideration of polarity? Explain which trend is more important in this case
Question- A gaseous system undergoes a change in temperature and volume. What is the entropy change for a particle in this system if the final number of microstates is 0.448 times that of the initial number of microstates
What is the frequency of the photon emitted when a molecule of NaH drops from the second vibrational level to the first vibrational level
The hormone epinephrine is released in the human body during stress and increases the body's metabolic rate. Epinephrine, like many biochemical compounds, is composed of carbon,
hat mass of agno3 169.9 gmol is needed to convert 2.33 g na2co3 106.0 gmol to ag2co3? or for the reaction to proceed to
3.24 x 10-3 g of a protein was dissolved in water (total vol. of 5.00 mL). Given the osmotic pressure of the solution was 1.50 x 10-3 atm and the temperature is 298.0K, calculate the molar mass of the protein.
Describe a non-chemical application of Le Chatelier's principle. What is the system in equilibrium. What is the stress. How does the system respond.
A 0.4600 g sample of carboxylic acid is burned in oxygen, producing 0.8202 g of CO2 and 0.3377 g of H20. Determine the empirical formula of the carboxylic acid.
How long will it take for all of the strontium 90 presently on the earth to be reduced to 1/32nd of its present amount?
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