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A powder contains FeSO4·7H2O (molar mass = 278.01 g/mol) among other components. A 3.075-g sample of the powder was dissolved in HNO3 and heated to convert all iron to Fe3 . The addition of NH3 precipitated Fe2O3·xH2O which was subsequently ignited to produce 0.304 g of Fe2O3. What was the mass of FeSO4·7H2O in the 3.075-g sample?
When diluting the juice samples with water, you did not need to be as accurate as in previous measurements. Why was the same level of precision not required?
Calculate the frequency of the light emitted when an electron in a hydrogen atom makes each of the following transitions.
what is the vapor pressure of a solution made by adding 164g flycerin to 338mL H2O at 39.8 C. The vapor pressure pf pure water at 39.8 C is 54.74 torr
What mass of this substance must evaporate in order to freeze 170 of water initially at 23? (The heat of fusion of water is 334 the specific heat of water is 4.18 .
What is the partial pressure in torr of O2 in the atmosphere that corresponds to this concentration? The Henry's law constant for O2 in water is 3.27 x 107 torr. How does this compare with the actual partial pressure of oxygen in the atmosphere
2-ethylcycloheptanol- draw the skeletal structure of the carbocation intermediate that leads to the major Organic product when this is reacted with H+ and heat.
It is desired to inflate a baggie with a volume of 869 milliliters by filling it with hydrogen gas at a pressure of 0.847 atm and a temperature of 296 K. How many grams of H2 gas are needed? answer in g please
If 25 ml of solution A is needed to make a 0.7 liters with a final concentration of 1.5%, what was the concentration percentage of the stock solution
What you observed upon the addition of NH3(aq) to magnesium chloride solution / what species are present in the test tube?and what happened when we add NH4Cl?
Compound X is a miracle drug used to cure every sneeze and sniffle. It is very expensive though and customers complain it doesn't always work as well as it should.
Suppose scheme one involves the reaction of the Grignard reagent containing more carbon atoms with the carbonyl compound containing less carbon atoms and scheme two involves the reaction of the Grignard reagent containing less carbon atoms with th..
What weight of A would be removed from a solution of 10g of A in 100mL of water by a single extraction with 100 mL of hexanes? What weight of A would be removed by four successive extraction with 25-mL portions of hexanes?
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