Textbook Question
Describe the reactions that occur when an Si1OH24 sol
becomes a gel. What is the formula of the ceramic obtained
when the gel is dried and sintered?
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Ch.12 - Solids and Solid-State Materials
Chapter 12, Problem 134
The mineral magnetite is an iron oxide ore that has a density of 5.20 g/cm³. At high temperature, magnetite reacts with carbon monoxide to yield iron metal and carbon dioxide. When 2.660 g of magnetite is allowed to react with sufficient carbon monoxide, the CO₂ product is found to have a volume of 1.136 L at 298 K and 751 mm Hg pressure. (a) What mass of iron in grams is formed in the reaction? (b) What is the formula of magnetite?
Verified step by step guidance1
Step 1: Write the balanced chemical equation for the reaction of magnetite (Fe₃O₄) with carbon monoxide (CO) to produce iron (Fe) and carbon dioxide (CO₂).
Step 2: Use the ideal gas law, PV = nRT, to calculate the number of moles of CO₂ produced. Convert the pressure from mm Hg to atm and use R = 0.0821 L·atm/mol·K.
Step 3: Use stoichiometry to determine the moles of iron produced. From the balanced equation, find the mole ratio between CO₂ and Fe.
Step 4: Calculate the mass of iron produced using the moles of iron and the molar mass of iron (55.85 g/mol).
Step 5: Determine the formula of magnetite by recognizing it as Fe₃O₄, a common iron oxide mineral.
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Explain why silicon carbide–reinforced alumina is stronger
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343
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Textbook Question
A group 3A metal has a density of 2.70 g/cm3 and a cubic unit cell with an edge length of 404 pm. Reaction of A 1.07 cm3 chunk of the metal with an excess of hydrochloric acid gives a colorless gas that occupies 4.00 L at 23.0 °C and a pressure of 740 mm Hg. (a) Identify the metal.
355
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Textbook Question
A cube-shaped crystal of an alkali metal, 1.62 mm on an edge, was vaporized in a 500.0 mL evacuated flask. The resulting vapor pressure was 12.5 mm Hg at 802 °C. The structure of the solid metal is known to be body-centered cubic. (b) Use the data in Figure 5.19 to identify the alkali metal.
644
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Textbook Question
A cube-shaped crystal of an alkali metal, 1.62 mm on an edge, was vaporized in a 500.0 mL evacuated flask. The resulting vapor pressure was 12.5 mm Hg at 802 °C. The structure of the solid metal is known to be body-centered cubic. (c) What are the densities of the solid and the vapor in g>cm3?
492
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