Chromium metal can be produced by the reduction of Cr2O3 with elemental silicon: 2 Cr203 + 3 Si → 4 Cr + 3 SiO2 If 350.0 grams of Cr203 are reacted with 235.0 grams of elemental silicon, 213.2 grams of chromium metal are recovered. What is the percent yield? % yield = i 0.32
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- Souring of wine occurs when ethanol is converted to acetic acid by oxygen: C2H5OH(l) +O2(g)--->CH3COOH(g)+H2O(l). A 1.00 L bottle of wine labeled as 7.00% (%v/v) ethanol, is found to have a defective seal. Analysis of 1.00 mL showed that there were 0.0274 g acetic acid in that 1.00 mL. The density of ethanol is 0.816 g/mL. (a) What mass of oxygen must leaked into the bottle in pounds(lb) (b) What is the percent yield for the conversion of ethanol to acetic acid, if oxygen is in excessA chemist carries out the reaction below and obtains 3.45g of iron Fe (Fe, MW=55.845g/mol). Fill in the blanks below to determine the percent yield of the reaction when 8.30g of Fe2O3 (MW= 159.69g/mol) and 3.50g of CO (MW=28.01G/mol)were used in the reaction. Fe2O3(s) + 3CO(g) = 2Fe(s) + 3CO2(g) Note that for two of the blanks, will be the same answer. 1. What would be the mass in grams of Fe produced based on the mass of Fe2O3 used? answer: (blank) 2. What would be the mass in grams of Fe produced based on the mass of CO used? answer: (blank) 3. What is the theoretical yield of Fe in grams? answer: (blank) 4. What is the limiting reagent? Enter the formula of compound. answer: (blank) 5. What is the percent yield of this reaction? answer: (blank)You were tasked to prepare 590 ml of 3.00 M HNO3. If you were provided a stock solution of 70.5% (w/w) HNO3 (MW = 63.0 g) with a specific gravity of 1.42, what volume of this solution (in ml) will you be using?
- Mass of Na2CO3.H2O (g) = 2.12g (g) Mass of the CaCl2.2H2O (g) = 1.98g Mass of the top funnel + filter paper (g) = 15.85g Mass of top funnel + filter paper + CaCO3 collected (g) = 17.81g CaCl2 + Na2CO3 ==== CaCo3 + 2NaCl Theoretical yield in moles and grams? Moles of reagent in excess left unreacted? Mass of precipitate? Experimental yield? Percent yield?A sample of ultrapure silicon was reacted with excess oxidizing yielding SiO2. After properfiltration and drying, the precipitate weighed 3.1754 g. If ultrapure silicon is 99.98% Si, what massof sample was used?Calcium peroxytoctahydrate is synthesized according to the following reaction. During the synthesis based on 3.5 g calcium carbonate, 7.5 mL of 18% HCl with a density of 1.19 and 5.5 mL of 25% NH3 with a density of 0.91 were used, and further hydrogen peroxide and excess water were added to the medium. Since 2.35 g of calcium peroxytoctahydrate is obtained in this way, what is the% yield of the experiment? (HCl: 36.5 g/mol; NH3: 17 g/mol; CaCO3: 100 g/mol; CaO2.8H2O: 216 g/mol) CaCO3 + 2HCl 2NH3 + H2O2 + 7H2O → CaO2.8H2O + CO2 + 2NH4+ + 2 Cl-
- balance C6H12O6+CO2+H2O with explanationanother question The aluminum in a 1.200g sample of impure ammonium aluminum sulfate was precipitatedwith aqueous ammonia as the hydrous Al2O3 · XH2O. The precipitate was filtered and ignitedat 100°C to give anhydrous Al2O3, which weighed 0.2001 g. Express the result of this analysisin terms of % Al.If 16.45 mL of ammonium thiocyanate solution is required to react completely with 25.00 mL of 0.1546 M AgNO3 solution, the molar concentration of the solution is _______ M ? Note: Express final answer using least number of significant figures. 2. A silver nitrate solution was prepared by dissolving 17.5031-g of primary standard grade AgNO3 (MW = 169.87 g/mole) in 1.50-L distilled water. The molar concentration of the solution is __________ M ? Note: Express final answer using least number of significant figures.
- For the following table fill in the missing values and calculate the theoretical yield. A + 2B à C moles 0.00242 0.00242 ?_________ MW ?_________ 98.06 164.16 g ?_________ ?__0.00002467_______ ?_________ mL 0.20 d(g/mL) 0.80An industrial-scale process for making acetylene consists of the following sequence of operations: CaCO3 → CaO + CO2limestone lime carbon dioxideCaO + 3 C → CaC2 + CO calcium carbide carbon monoxideCaC2 + 2 H2O → Ca(OH)2 + C2H2 calcium acetylene hydroxide What is the percentage yield of the overall process if 2.32 metric tons C2H2 is produced from 10.0 metric tons limestone (1 metric ton 5 1000 kg)?Consider the titanium thermite reaction: Ti2O3 (s) + 2 Al (s) -----> Al2O3 (s) + 2Ti (l) You attempt this reaction with 100.0g of Ti2O3 and 100.0g of 100.0g of powdered aluminum(Al). c) Determine the mass of liquid titanium produced by this reaction. d) What is the Percentage Yiled of liquid titanium if we were only able to produce 40.0g of the product?