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- 4. H2, Lindlar's catalystZOOM + 1. Calculate the molar mass of the following compounds. a. magnesium phosphate b. sodium sulfide c. dinitrogen tetroxide 2. Determine the molar mass of these ceramic materials. а. HfN b. ThO2 с. ВаTiO; 3. A chemist needs exactly 2 moles of NAOH to make a solution. What mass of NaOH must be used? 4. What mass of ozone (O3) gives 4.5 moles of the substance?5 5. Calculate the mass in the grams of each the following. a. 2.5 mol of aluminum b. 1.25×10-3 mol of iron c. 0.015 mol of calcium d. 653 mol of neon 6. Calculate the mass in grams of 13.5 mol of a. vinyl chloride, C,H3CI, the starting material for a plastic b. capsaicin, C13H27NO3, the substance that makes red chili peppers "hot" c. stearic acid, C13H36O2, used in soaps 7. How many moles are present in the given quantities of explosives? a. 358.1 g trinitrotoluene (TNT), C,H;N;O6 b. 82.6 g nitromethane, CH3NO2 c. 1.68 kg RDX, C;H,N,O6 8. How many H atoms are present in 7.52 g of propane, C3H3? 9. How many O atoms are present…A mixture contains Na2CO3, NaOH, and inert matter. A sample weighing 1.500 g requires 28.85 mL 0f 0.5000 M HCl to reach a phenolphthalein end point, and an additional 23.85 mL to reach a methyl orange end point. What is the percentage of NaOH in the sample? a. 8.5% b. 50.68% c. 6.67% d. 20.56% e. 84.27%
- 3. PROVIDE FINAL PRODUCTS CI 1. Br2, hv 2. CzHz, NaNH, 3. BH3-THF then H₂O2, NaOH 4. Vinyllithium, Et₂0 5. H3PO4, A fo 1. 2. HBr LiCu 3. Mgº, Ether 4. CO2, then H30+ 2 ?You have a mixture of KCI, BaCO3, and SiO2, From the following, select the steps that would allow you to separate and isolate the KCI and SiO2 from the mixture. Step 1 A. Add a solution of 0.1 M AgNO3(aq), stir, and decant the supernatant Step 2 three times. Step 3 B. Heat the residual solid SiO2 to remove the water. C. Add a non-polar solvent, stir, and decant the supernatant three times. Evaporate the water from the combined supernatant. D. Add water, stir, and decant the supernatant three times. Evaporate the water from the combined supernatant. E. Heat the mixture to sublime one of the components. F. Add a solution of 1 M HCI, stir, and decant the supernatant three times.NH2 OH from b.
- 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?9. Write the balanced equation for the following reactions a. C6H10(g) + O2(g) ⟶⟶ CO2(g) + H2O(l) b. C11H18O7N5 + O2 → CO2 + H2O + NH35.00 mL of stock solution is diluted to 25.00 mL, producing solution ALPHA. 10.00 mL of solution ALPHA is diluted to 25.00 mL, resulting in solution BETA. 10.00 mlL of solution BETA is then diluted to 25.00 mL, producing solution GAMMA.
- 12. For each reaction below, the starting mass/volume of each reagent is provided as well as the final mass of product isolated. Calculate the theoretical and percent yield for each reaction. a. b. OH OH + l MW 122 1.50 g CI MW 141 d 1.21 g/mL 0.250 mL MW 60.1 7.40 g 1. PhMgBr MW 181 905 mg 2. HCI H3PO4 OH Ph MW 164 1.86 g Ph MW 260 547 mg + H₂O%24 4. What kind of reaction is this? Ba(CIO3)2→BAC12+302 O Combustion O Synthesis O Sirgle replacement O Decomposition MacBook Pro 田 %23 3. -5 6.Gravimetric analysis of Fe3O4 (MW = 232 g/mole) may be undertaken with the following reactions: Fe3O4 → Fe2O3 → Fe (OH)3. Weight of sample containing 8.00% Fe3O4 that must be taken to obtain a precipitate of Fe(OH)3 (MW = 107 g/mole) that weighs 150 mg is . a. 0.108 g b. 0.325 g c. 1.355 g d. 4.065 g Amount of Fe2O3 (MW = 160 g/mole) from which 150 mg of Fe(OH)3 (MW = 107 g/mole) may be obtained is . a. 0.112 g b. 0.224 g c. 0.448 g d. none of the other choices