Numerade

Questions asked

INSTANT ANSWER

A company that sells modems throughout Turkey sells 600 modems per month in the west of Izmir region. A modem costs the dealer $ \$ 160 $. It costs \$8 to maintain a modem for a month and the cost per order is $ \$ 200 $. If there is no modem at hand, the requests are recorded and delivered to the address in the first order, and the cost is calculated as \$24. The dealer works 24 days a month. Based on the given information, which of the following is/are correct? Total cost is $ 90200 \$ $. The maximum inventory level is 150 units. 200 orders are placed every 6 days. A) III only B) I and III C) I, II and III D) II and III E) II only

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A firm's demand rate for a particular product is fixed and known as 50 tons per month. The company orders this product from its supplier and all orders come at the same time. Out of stock is allowed. If the monthly holding cost of this product is 4 dollars, the maximum stock amount is 15 tons, and the number of orders per year is 24 , calculate the monthly unit depletion cost of this product. A) 1.75 B) 2.5 C) 2.25 D) 2 E) 1.5

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In the extraction of 500 kg cottonseed containing 40% oil with hexane, the oil is separated as 30% solution and At the end of the extraction, 20% of the oil in the seed remains in the sludge. In this situation, a. Find the required amount of hexane and the amount of clear oil solution taken out. b. After extraction, the precipitate is washed twice with pure hexane and the washing solution is cleared by precipitation again. is taken out. Hexane equal to ¾ of the solution taken out in the first wash, and hexane in the second wash. Since ½ of the solution taken with hexane is used, the amount of oil remaining in the sludge after washing processes calculate.

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Mixture of acetone:toluene containing 40% acetone by mass, operating at atmospheric pressure with a capacity of 7,500 kg/h, as the main product. 95% by mass of acetone; the bottom product is 98% by mass of toluene. project is requested. For each kilogram of the head product, 2.5 kg of rifax is used and the mixture to be distilled Since it enters the distillation column as saturated steam; a. Calculate the flow rates of the head and bottom products. b. Calculate the amount of heat taken from the system in the condenser. (hF: 41.0 kcal/kg; H1: 130.0 kcal/kg; hW: 50.0 kcal/kg; hD: 15.0 kcal/kg) c. Calculate the number of racks required for this distillation column and from which rack the feeding should be made. d. If all other conditions remain the same, the amount of rifax applied per kilogram of head product is increased from 2.5 kg to 5 kg. is removed and the mixture to be distilled is fed into the distillation column as a liquid at boiling point. Explain the changes that will occur in the system by making calculations.

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Flow rate 2 m3/h, oil with a specific heat of 2.219 J/kg.°C and a density of 840 kg/m3 in a heat exchanger from 160 °C to 40 °C is cooled. While the oil is cooling, its flow rate is 15 m3./hour, water with a specific heat of 4.177 J/kg.°C and a density of 998 kg/m3 is heated to 35 °C. until it warms up. Total heat transfer coefficient (U) of the heat exchanger 1.150 W/m2×°C Since; a. parallel current, b. Find the heating surface area for countercurrent situations.

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ANSWERED

Nicole Krahulik

Numerade educator

Balance the redox reaction of MnO4- + NH3 ↔ MnO2 + NO3- in basic environment.

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INSTANT ANSWER

\begin{tabular}{|l|l|} \hline$ v(\mathbf{m L}) $ & $ p A g $ \\ \hline 2 & \\ \hline 5 & \\ \hline 8 & \\ \hline \end{tabular}

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ANSWERED

David Collins

Numerade educator

These cations in the mixture solution containing 10-2 M Cd(II) and 10-2 M Co(III) are desired to be separated from each other quantitatively. Calculate the appropriate pH range to separate these cations by precipitation as their hydroxides. pK (Cd(OH)2) = 14 ; pK (Co(OH)3) = 44

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50 mL of 0.1 M MgCl2 solution is mixed with 51 mL of 0.1 M Na2CO3 solution. a) Find the pH required for the MgCO3 compound to begin to precipitate. b) What should be the required pH value for its quantitative precipitation? pK(MgCO3) = 7.5 ; for H2CO3: pK1 =4; pK2 = 10

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Thallium sulfide (Tl2S) less soluble compound; a) Calculate the solubility of 3x10^-2 M TlNO3 (ignoring the basicity of sulfur and taking into account the ionic strength). b) Calculate the solubility of this compound (without considering the ionic strength) at pH = 2.0 pK (Tl2S) = 20.0 ; For H2S: pK1 = 7.0; pK2 = 13.0

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Kleiner P.