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Chapter 3: Q3.28P (page 132)
The mineral galena is composed of lead(II) sulfide and has an average density of.
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3.14 Calculate each of the following quantities:
(a) Mass in grams of mol of
(b) Moles of compounds in 15.8 kg of
(c) Number of N atoms in 92.6 mg of
Cocaine (C17H21O4N) is a natural substance found in coca leaves, which have been used for centuries as a local anesthetic and stimulant. Illegal cocaine arrives in the United States either as the pure compound or as the hydrochloride salt (C17H21O4NHCl). At 25oC, the salt is very soluble in water (2.50 kg/L), but cocaine is much less so (1.70 g/L). (a) What is the maximum amount (in g) of the salt that can dissolve in 50.0 mL of water? (b) If the solution in part (a) is treated with NaOH, the salt is converted to cocaine. How much additional water (in L) is needed to dissolve it?
Hemoglobin, a protein in red blood cells, carries from the lungs to the body鈥檚 cells. Iron(as ferrous ion, ) makes up 0.33 mass % of hemoglobin. If the molar mass of hemoglobin is 6.8 g/mol, how many ions are inone molecule?
When powdered zinc is heated with sulfur, a violent reaction occurs, and zinc sulfide forms:
Some of the reactants also combine with oxygen in air to form zinc oxide and sulfur dioxide. When 83.2 g of Zn reacts with 52.4 g of S8, 104.4 g of ZnS forms. What is the percent yield of ZnS? (b) If all the remaining reactants combine with oxygen, how many grams of each of the two oxides form?
Percent yields are generally calculated from mass quantities. Would the result be the same if mole quantities were used instead? Why?
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