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- A pool is treated with calcium hypochlorite pool shock. If Ca(OCl)subscript2 has 50% available chlorine by mass, what ppm chlorine increase will result from the addition of 5kg of pool shock to a 40x10raised to 3 L swimming pool? I think if I can understand this one I can apply the principles to other practice problems. Thanks so much!Topic : Mixture Flow Problem A tank contains 2000 L of brine. Brine containing 5N/L of salt flows in at 10L/min, and the mixture , kept uniform by stirring, flows out at the rate of 20L/min. If the concentration of salt is 8N/L at the end of 1 hour, how much was the concentration of the salt at the beginning? Ans. 9.29 N/LCalculate the % (m/m) of helium gas in a mixture containing 15.0 g of helium gas and 45.0 g of nitrogen gas. Note that Nitrogen gas is a diatomic molecule.Answer = _______
- 7. What is the mass in grams of a 34 oz salt? Local gravity is 9.65 m/s²? kindly include the figure, analysis and findingsDeionized water is added to a 138.0 mL sample of 1.103 M oxalic acid to dilute it to 0.436 M. What volume of water, in mL, was added to dilute the sample? Round answer to correct sig figs.ANSWER (D) (a) The recommended daily allowance (RDA) of the trace metal magnesium is 410mg/day for males. Express this quantity in g/day. (b) For adults, the RDA of theamino acid lysine is 12 mg per kg of body weight. How many grams per day shoulda 75 kg adult receive? (c) A typical multivitamin tablet can contain 2.0 mg of vitaminB2 (riboflavin), and the RDA is 0.0030 g/day. How many such tablets should a persontake each day to get the proper amount of this vitamin, assuming that he gets nonefrom any other sources? (d) The RDA for the trace element selenium is 0.000070g/day. Express this dose in mg/day.
- i already have answers for items a-d. Experiment Molar mass, g/mol 1 6.9391 2 6.9407 3 6.9409 4 6.9399 5 6.9407 6 6.9391 7 6.9406 (a) Find the mean molar mass determined by these workers. (b) Find the median molar mass. (c) Assuming that the currently accepted value for the molar mass of lithium is the true value, calculate the absolute error and the percent relative error of the mean value determined by Richards and Willard. (d) Find in the chemical literature at least three values for the molar mass of lithium determined since 1910 and arrange them chronologically in a table or spreadsheet along with the values since 1817 given in the table on page 10 of the paper by Richards and Willard. Construct a graph of molar mass vs. year to illustrate how the molar mass of lithium has changed over the past two centuries. Suggest possible reason(s) why the value changes abruptly about 1830. (e) The incredibly detailed experiments described by Richards and Willard suggest that it is unlikely…Multiple Choice: The average volume of a human breath is roughly 500 mL. How many moles do you inhale with each breath on a day when the temperature hovers near freezing? Assuming that human exhalations eventually intermix evenly throughout the approximately 3 × 10(exponent 22) L of Earth’s atmosphere, how many mole(s) of particles of air is in each breath? a. 0,28 mol b. 0,02 mol c. 0,2 mol d. 0,002 mol0.070 grams of nickel (II) hydroxide (MM•92.71g/mol) dissolve in 500.00 mL of water at 20.0 Celsius. What is the Ksp for nickel (II) hydroxide? Show all work, give correct sig figs, thank you!