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- Solid calcium carbonate, CaCO3, was added to a solution of pure water. Analysis found 1.20*10-3 M Ca2+ ions in solution. Calculate the Ksp of CaCO3. Be sure to use 3 significant digits in your answer.Does anyone know how to answer this question: Please helpWhat is the percentage change in x in going from x1 to x2 (%∆x)? a) 100(∆x1/x) b) 100(∆x2/x) c) 100(∆x/x1) d) 100(∆x/x2) e) none of the aboveIn a survey of 1000 large corporations, 250 said that, given a choice between a job candidate who smokes and an equally qualified nonsmoker, the nonsmoker would get the job (USA Today).(a) Let p represent the proportion of all corporations preferring a nonsmoking candidate. Find a point estimate for p.(b) Find a 0.95 confidence interval for p.(c) As a news writer, how would you report the survey results regarding the proportion of corporations that hire the equally qualified nonsmoker? What is the margin of error based on a 95% confidence interval?
- your're in canada on vacation and drive into 30 km/hr speed zone. how fast is the speed limit in m.p.hCalculate the Ka of X in chloroform. Answèr in 4 significant figures.Calculate the percent difference between x2 and x4 according to the equation below. (Assume x2 to be the accepted value.) Record the calculation in your notes. x2 = 100.4 kJ x4 = -100.4 kJ %difference = experimental value - accepted value x 100% accepted value
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- Carbon tetrachloride reacts at high temperatures with oxygen to produce two toxic gases, phosgene and chlorine.CCl4(g) + 1/2O2(g) COCl2(g) + Cl2(g), Kc = 4.4 × 109 at 1,000 KCalculate Kc for the reaction 2CCl4(g) + O2(g) 2COCl2(g) + 2Cl2(g). Round off the answer to two significant digits. Group of answer choices 4.4 × 109 8.8 × 109 1.9 × 1010 1.9 × 1019 2.3 × 10–10Analysis of product: Calculate the percent recovery based on the amount of tea originally used and a final mass of 0.20g of caffeine obtained. Compare this value against a literature search about the approximate caffeine content by percent in black tea. Given: the observed melting point of the product crystals is 230oC-235oC -10 tea bags (black tea, contains ~45mg caffeine/bag) -total mass is 21.10g of the loose black tea13. A sample of 15.00 g of a hydrated sodium sulfate salt contains 7.05 g of water. The value of the "x" in the hydrated salt is: NaSO4 . xH2O Answers: a)7 b)10 c)1 d)3 e)5