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Inorganic Chemistry
How many 204Pb atoms are there in an 857 mg lead sample?
Inorganic Chemistry
A laboratory test for gastric acidity calls for 0.1 NaOH. Prepare 40.0mL of a 10X stock solution of this reagent using two NaOH solutions, one labeled 20% and the other 0.75N. How much 20% NaOH and 0.75N NaOH must be mixed together to produce 40.0mL of 10X stock?
Inorganic Chemistry
What is the ratio of energy difference between Bohr's first orbit and second orbit,and that of between third and second orbit ?
Inorganic Chemistry
The next three (3) problems deal with the titration of 421 mL of 0.501 M carbonic acid (H2CO3) (Ka1 = 4.3 x 10-7, Ka2 = 5.6 x 10-11) with 2.1 M NaOH.
1. What is the pH of the solution at the 2nd equivalence point?
2. What will the pH of the solution be when 0.1316 L of 2.1 M NaOH are added to the 421 mL of 0.501 M carbonic acid?
3. How many mL of the 2.1 M NaOH are needed to raise the pH of the carbonic acid solution to a pH of 6.019?
1. What is the pH of the solution at the 2nd equivalence point?
2. What will the pH of the solution be when 0.1316 L of 2.1 M NaOH are added to the 421 mL of 0.501 M carbonic acid?
3. How many mL of the 2.1 M NaOH are needed to raise the pH of the carbonic acid solution to a pH of 6.019?
Inorganic Chemistry
BaCl2 + Na3PO4 -----> NaCl + Ba3(PO4)2.
If 0.5 moles of BaCl2 is mixed with 0.2 moles of Na3PO4, the maximum number of moles of Ba3(PO4)2 that can be formed is?
If 0.5 moles of BaCl2 is mixed with 0.2 moles of Na3PO4, the maximum number of moles of Ba3(PO4)2 that can be formed is?
Inorganic Chemistry
the USEPA assumes that each person breathes 20 cubic meters of air per day. If the air we breathe in has 50% relative humidity at 20 °C, and we breathe it out with 100% relative humidity at 37 °C, how many milliliters of water would we need to drink each day just to replace the water lost by breathing? The vapor pressure of water at 20 °C is 17.5 mmHg and at 37 °C it is 47.1 mmHg. Assume the volume of air
breathed in is the same as that breathed out.
breathed in is the same as that breathed out.
Inorganic Chemistry
An underground storage tank was used to store toluene. Over a period of time some of
the toluene leaked from the tank, contaminating the soil and groundwater below the tank.
A subsurface investigation reveals that approximately 100 pounds of toluene remains in
the vadose zone (above the water table). It is proposed to clean the soil by soil vapor
extraction, in which air is drawn through the soil to vaporize the contaminant. Assuming
the toluene behaves as a pure substance, estimate the minimum volume of air which
would be needed to remove all of the toluen
the toluene leaked from the tank, contaminating the soil and groundwater below the tank.
A subsurface investigation reveals that approximately 100 pounds of toluene remains in
the vadose zone (above the water table). It is proposed to clean the soil by soil vapor
extraction, in which air is drawn through the soil to vaporize the contaminant. Assuming
the toluene behaves as a pure substance, estimate the minimum volume of air which
would be needed to remove all of the toluen
Inorganic Chemistry
10 g sample of CaCl2 and NaCl is treated to precipitate all the Calcium as CaCO3. This CaCO3 is heated to convert all the Ca into CaO and final mass of CaO is 1.62 g. The % by mass of CaCl2 in the original mixture is?
Inorganic Chemistry
The black compound which on heating with concentrated Hydrochloric acid gives a greenish yellow gas
Inorganic Chemistry
Please explain the General reaction of the Conjugation with Glycine, Gluthamine, and Other Amino Acids.
