Question 65 pts 1DetailsSuppose that a shipment of 18 calculators is received by a school. Suppose also that 37% of all calculatorshave dead batteries.(a) Fill in the values below.n =p =1-p=(b) What is the mean (or expected value) of the number of calculators received by the school that havedead batteries.Do not round.(c) What is the standard deviation of the number of calculators received by the school that have deadbatteries.Round to 2 decimal places.

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Answered: Question 6 5 pts 1 Details Suppose that…

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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1. Fish liver oil is a good source of vitamin A, whose concentration is measured spectrometrically at a wavelength of 329 nm. (a) When 0.1232 g of fish-liver oil is dissolved in 500. mL ofsolvent, the absorbance is 0.724 units. When 1.67×10−3 g ofvitamin A is dissolved in 250. mL of solvent, the absorbanceis 1.018 units. Calculate the vitamin A concentration in thefish-liver oil. (Please type answer no write by hend).
(b) Shown below are three different van Deemter curves for particles of varying sizes. Propose explanations for their differences based on terms in the van Deemter equation. Thereby explaining why smaller particle size is desirable. HETP (μm) 60 9 20 0 0 2 10 5 µm 4 FLOW RATE (mL/min) 6 10 μm 3 μm 8
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Suppose the absorbance of a 0.084 M solution of nickel(II) nitrate in water is measured to be 0.305 in a cuvette with a path length of 1.00 cm. If the solution is then diluted by a factor of 3, what do you expect the absorbance of the diluted solution to be, when measured in the same 1.00-cm cuvette? Round your answer to the correct number of significant figures
A 0.2 g sample of NazC204 consumed 30.92 ml of KMN04 to reach the faint pink endpoint in the standardization of KMNO4 solution. This standardized solution was used to analyze the calcium in a milk sample (density = 1.21 8/mL) by permanganimetry. A 5.9 ml of the milk sample was diluted to 250.0 mL, and a 25.00 mL aliquot was treated with (NH4)2C204 to precipitate calcium as Cac,04+H2O. Digestion, filtration and addition of acid followed and during titration, 20.01 mL of standardized KMNO4 was consumed. Calculate the % Ca (W/w) of the milk sample analyzed. Express your answer in 2 decimal places. No need to include the unit. MM (g/mol): NazC204 = 134 ; Ca = 40.08 Pertinent redox reactions: NazC204 + 2H30* → H2C204 + 2H20 + 2Na* 2Mno4 + 5H2C204 + 6H30* → 2MN2- + 10CO2 + 14H20 Caco3 + 2H30* → Ca2- + CO2 (g) + 3H2O Ca2* + C2042 + H2O → CaC204+H2O(s) CaC204+H2O(s) + 2H30* – Ca2* + H2C204+ H20 Round your answer to 2 decimal places.
A stock solution of 0.225 +/- 0.003 M NaNO2 was transferred to a 100 mL volumetric flask (class A) and diluted to the mark. If 7 mL of the stock solution was transferred using one 5-mL and two 1-mL volumetric pipettes, what is the new concentration of the solution and the uncertainty?
A volumetric calcium analysis on triplicate samples of the blood serum of a patient believed to be suffering from a hyperparathyroid condition produced the following data: mmol Ca/L = 3.55, 3.65, 3.14. What is the 95% confidence interval for the mean of the data, assuming(a) No prior information about the precision of the analysis?(b) s → σ = 0.056 mmol Ca/L?
Il 42.7 mL of 0.202 M HCl solution is needed to neutralize a solution of Ca(OH)2, how many grams of Ca(OH)2 must be in the solution? Express the mass in grams to three significant digits. IVD ΑΣΦ m = m= ? If 45.3 mL of 0.114 M HCl solution is needed to neutralize a solution of KOH, how many grams of KOH must be present in the solution? 15. ΑΣΦ g ESMIC ? g
/1wdGaF3fc41TY-3NU4JhvIQJLK2kFekLX/edit minutes ago IUA 三 ==,E 三E|X 20 2 | E 3 LI 4 IT3 E OI I 7 + EXPERIMENT Percent vield Due after completing the lab. Answer in the space provided. 1. A student reacted 0.500 g of Pb(NO.)2 with 0.750 g of KI according to the reaction, Pb(NO.b (aq) + 2 KI (aq)- → Pbb (s) +2 KNO: (aq) How many moles of Pb(NO.)2 were used? mol of Pb(NO) b) How many moles of KI were used? mol of KI c) How many moles of PbL would form, based on mol of Pbb the moles of Pb(N0) used? d) How many moles of Pbl would form, based on mol of Pbl the moles of KI used? e) Which is the limiting reactant? What is the theoretical yiekd of PbL in grams? 主 g of PbL g) If the student obtained 0.583 grams of PbL product after collecting it by fihration and dry ing it, what was the percent yield of Pbl obtained? 2. Diborane, B H, can be produced by the following reaction: NaBH (aq) H 50 (a) = H (g) = Na SO (aql= BH(B) What is the maximum quantity, in grams, of B H that can be prepared…
What is the absolute uncertainty and relative uncertainty of the molarity of the solution? M = = 0.078376462 = 0.078 M Pb2+
1
Ben ran through the experiment and found the best-fit line listed below for his standard calibration curve of absorbance vs concentration in M. y = 3214.0x + 0.0076 Ben then prepared a solution that had 5.00 mL 0.002 M iron(III) nitrate in 1 M nitric acid, 3.00 mL 0.002 M potassium thiocyanate, and 2.00 mL DI water. If the absorbance for the solution was 0.436, calculate the equilibrium concentration of iron(III) thiocyanate in the solution. Report your answer in mM with three places after the decimal.

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