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Chemistry Questions and Answers October 11, 2019

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(a) You are asked to make 10mL of a 10% solution of organic fuel. How many grams of fuel will you need to make your solution? The definition of a 10% solution is 10g of solute in a 100mL solution. (b) you will pour 10mL of your 10% solution into an empty beaker. How much water (in mL) should you add to the beaker to create a 5% solution? Assume

Average seawater has the following chemical composition in ppm (or mg/L): In this problem, you cannot assume that a = m, so you will have to calculate activities for some species using the Truesdell-Jones equation. Answer the following and state your assumptions: a) What are these concentrations in moles/kg? b) Do the charges balance (total + =
Na 10570 380 406 So42- CI- НСО: Co. 2664 19011 K+ Ca+ 121 Mg++ Br 1271 66 T= 25°C Gff 298.15 (NaCl) = -384.2 kJ mol Gff 298.15 (Na

Calculate S (for the system) when the state of 3.10 mol of perfect gas atoms, for which C p ,m = 5/2 R , is changed from 25C and 1.00 atm to 125C and 5.00 atm. How do you rationalize the sign of S ? a. Though S (system) is positive, the process can still occur spontaneously if S (total) is negative. b. Though S (total) is negative, the

1. If a student weighs 0.0985 g of Cu sponge at the beginning of his/her experiment: a. How many moles of Cu metal is this? b. How many moles of hydrated copper (II) ion would be produced when weighed Cu metal dissolves in enough HNO, solution? c. How many moles of Cu(OH), will be formed? d. How many moles of CuO will be formed? e. How many moles

1. The test tube that contained the calcium metal was probably the most difficult of the test tubes to clean. Why was aqueous HCl used to clean the test tube? Write the balanced chemical equation fo the reaction that took place in this test tube as part of your answer. (little if any unreacted Ca metal was left in that tube-what chemical was