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A: Ans it true
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A: Step : 1 Calculate mass percent composition of this solution
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- The %purity of a powdered crude sample of Na2CO3 containing only inert impurities is to be determined by reacting 225.0 mg of the crude sample to 10.0 mL of 3.00 M HCl solution, and bubbling the resulting CO2(g) product in water that is at exactly 29 °C. After the reaction has completed, the level of the liquid inside the eudiometer rests 4.30 cm above the water level in the beaker. The graduation on the eudiometer indicates that the trapped gas is 44.37 mL. The experiment was done under a barometric pressure of 755.2 torr. a. How many moles of CO2 were collected? b. What is the percent purity of the sample? Round off to the nearest whole numberThe %purity of a powdered crude sample of Na2CO3 containing only inert impurities is to be determined by reacting 225.0 mg of the crude sample to 10.0 mL of 3.00 M HCl solution, and bubbling the resulting CO2(g) product in water that is at exactly 29 °C. After the reaction has completed, the level of the liquid inside the eudiometer rests 4.30 cm above the water level in the beaker. The graduation on the eudiometer indicates that the trapped gas is 44.37 mL. The experiment was done under a barometric pressure of 755.2 torr. What CASE does this experiment satisfy?Define the relative amounts of liquid and vapor phases in a saturated mixtureare specified by the quality x.
- a concentrated H2SO4 has the following composition specific gravity 1.84 and purity of H2SO4 is 97 percent by weight. express in mole/LTaylor was harvesting her beautiful, pure crystals via vacuum filtration from a methanol/water mixedsolvent system. She poured the solution containing her crystals into the Büchner funnel. Then sherinsed her flask with some warm methanol and poured that over the crystals resting in the Büchner…oops! Tell what happened and whyWhich properties would be ideal in selecting the compound to be used as a primary standard for quantitative volumetric analysis? HygroscopicVaporLiquidExpensiveSome PurityVolatileNot HydroscopicSolidStableLow Molecular Weight
- Suppose you have a soil that is made up of 10% organic matter with CEC = 200 cmol/kg, 40% kaolinitewith CEC = 10 cmol/kg, and 50% vermiculite with CEC = 100 cmol/kg.1- Calculate the overall CEC of the soil by taking a weighted average of the three soil components.2- What percentage of the overall CEC is contributed by the organic matter? How does that numbercompare to the 10% of the soil itself that is organic?The following evidence was obtained from an experiment to determine the solubility of calcium chloride at room temperature. A sample of saturated calcium chloride solution was evaporated to dryness, and the mass of solid residue was measured.EvidenceVolume of solution (mL) = 15.0Mass of empty beaker (g) = 90.54Mass of beaker and residue (g) = 101.36The solubility of calcium chloride is g/100 mLAnalyze the effects caused by various impurities on precipitate duringthe gravimetric analysis and suggest the measures to reduce the impactof these impurities.
- Nitroethene, CH2CHNO?, is a very labile compound that must be prepared with care. Ifpurification of nitroethene s attempted, generally only small amounts are recovered, but theinner walls of the distillation apparatus are covered with a white film. Explain.A student obtained a solid product in laboratory synthesis. To verify the identity of the solid, she measured the milting point and found that the material melted over a 12°C range. After it had cooled, she measured the melting point of the same sample again and found that this time the solid HUD a sharp melting point at the temperature that is characteristic of the desired product Why were the two melting points different? What was responsible for the change in the melting point?Polyethylene terephthalate is an example of synthetic material in Materials and Engineering. 1. Describe the relation of its building blocks in connection to its “bulk” (materials) properties. (No need for essay, just a brief scientific explaination!) If you may, please send link as well of the reference that you use for the answer).