What is the molar mass of alumina: Al2O3 ?
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Rubies are essentially alumina Al2O3 with a contaminant of chromium in the form of Cr2O3. A lab made ruby weighing 1.994 g is ground, digested in hot nitric acid, and the chromium precipitated as Cr(OH)3 If the mass of the Cr(OH)3 is .0135 g, compute the percentage of chromium in the ruby. Also compute the percentage of Cr2O3 in the ruby.
Question text What is the molar mass of Al2O3? (Use 3 significant figures) Select one: a. 43.0 b. 113 c. 102
A sample weighing 3.099 g is a mixture of Fe2O3 (molar mass = 159.69) and Al2O3 (molar mass = 101.96). When heat and a stream of H2 gas is applied to the sample, the Fe2O3 reacts to form metallic Fe and H2O(g). The A1203 does not react. If the sample residue (the solid species remaining after the reaction) weighs 2.498 g, what is the mass fraction of Fe2O3 in the original sample? Number g FeO g original sample
A sample of pure alumina hydrate was obtained from a bag of flame retardant. A 5.000 g sample of the material was heated carefully in a vacuum oven until no more mass was lost from the sample. After heating, the final weight of the material was 2.6636 g. What was the formula of the hydrated alumina, Al2O3•xH2O? (Enter a whole number for "x") (mol. wt. Al2O3 = 101.96)
The theoretical failure strength of high-purity and fully-dense aluminum oxide (Al2O3, alumina) can be up to 4 GPa ! In other words, a pristine alumina sample is expected to support this stress, even in tension, since no stress magnifying flaws would be present. Think about that for a second ... most metals yield (bend permanently) at stress levels on the order of 0.1 - 0.5 GPa ... and this is considered their upper limit for structural use. Ceramics like alumina...
consider the following reaction 2Fe + Al2o3-> 2al fe2o3 what mass is produced when 5g of Fe and 5g of al2o3 react
Calculate Moles of oxygen needed to react with 4.21 mol of Al. What mass of Al2O3 should be produced? 4 Al (s) + 3 O2 (g) → 2 Al2O3 (s)
what is the molar mass of CO2? what is the molar mass of HC2H3O2?
Find the mass of AlCl3 that is produced when 25.0 grams of Al2O3 react with HCl according to the following balanced equation. Al2O3(s) + 6HCl(aq) → 2AlCl3(aq) + 3H2O(l)
Prelab Questions: Apparent Molar Mass of Air 1. What is a molar mass (of a compound)? What are its units? 2. What is the equation for the ideal gas la? What units are typically used? Hint: pressures are typically measured as atmospheres or torr.] 3. Rearrange the ideal gas law to solve for moles (n) flask assembly containi air has a mass of 138.562 g at 25 138.541 g when submerged in boiling water at 99.7°C, calculate the molar mass...