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The town in mid west has been experiencing the steady population decline of 5 % per year for past decade. If there were 40750 residents in year 2011 and trend continues, determine population in the
It was extremely dark in room and banta could not see cards, after thinking bit banta divided cards in 2 piles and quite surprisingly on counting number of inverted cards in both piles were equal. W
At the library 200 people were surveyed about magazines they read. 75 read US News, 45 read Rolling Stone, 120 read Time, 15 read all three magazines.
To generate the profit from its online publishing service, SOBooks.com requires to know how demand for novels depends on price it charges.
The insurance company wants to forecast amount of life insurance held by family heads. Company drew the sample of 6 family heads and secured the given information.
Find lengths of each piece of wire which make sum of areas of square and triangle a maximum? Find unknown(s) in terms of the variable and the word phrase.
Consider the organism, with overlapping generations, like humans or E. coli. Their population is forecasted to double in 15 years. Determine the per capita growth rate?
At a point downstream, the air flows through a 5.00 cm ID pipe at 60 degrees Celsius and 1.53 bar (gauge) when a stream of air enters a 7.50-cm ID pipe at a velocity of 60 m/s at27 degrees Celsius
Determine the numbers of minutes are needed for the 20% of a sample of cyclopropane to isomerize to the propene? At 700 K, the rate constant for the following reaction is 6.2 ´10-4min1
Determine the activation energy for the decomposition of O2 by the reverse reaction if the activation energy for the reaction O +O3 ®2O2 is 25 kJ/mol, and the enthalpy change is&nbs
A sample of an unknown acid which is having 2.20 g (empirical formula = C3H4O3) is dissolved in the 1.0 L of water. A titration needed the 25.0 mL of 0.500 M NaOH to react totally with all
Sodium chlorate decomposes to produce the oxygen and sodium chloride gas at the elevated temperatures. A sample of impure sodium chlorate which is having 0.8765 g was heated until the production of
When at 30. °C the 121 mL water is mixed with the 63 mL water at 84°C, determine the final temperature assume that no heat is lost to the surroundings and that the density of water is 1.00
What was the initial temperature of ethylene glycol if the final temperature is 32.5°C (c of ethylene glycol =2.42 J/g·K) if a 26.3 g sample of ethylene glycol, a car radiator coolant,
Suppose a sodium hydroxide solution is usually standardized by titrating a pure sample of potassium hydrogen phthalate (KHP), an acid with one acidic hydrogen and a molar mass of 204.22 g. It takes
A 1.345-g sample of a compound of oxygen and barium was dissolved in the hydrochloric acid to give a solution of barium ion, which was then precipitated with an excess of potassium chromate to give
Determine the concentration of the Na2S2O3 solution if the 36.30 mL of a0.1100 M I2 solution react exactly with a 100.0 mL sample of the Na2S2O3 solution.
A sample of iron ore which is having 3.33-g, transformed to a solution of iron(II) sulfate, FeSO4, and this solution is titrated with the 0.150 M K2Cr2O7 (potassium dichromate).
Determine the value of k for this reaction if the half-life for this reaction is 2.00 s when [NOBr]0= 0.900 M. Explain how much time is needed for the concentration of NOBr to decrease to 0.113
You dissolve the tablet in hydrochloric acid and filter off insoluble material. An antacid tablet has calcium carbonate as the active ingredient; other ingredients include a starch binder.
Under the same conditions, the rate of effusion of Pure Methane (CH4) gas is 47.8 mL/min. What is the molar mass of unknown gas if the rate of effusion of a particular gas was calculated and found
A 10.00-gram sample of this mixture is dissolved in the acid, and reacted with excess sodium oxalate to produce a precipitate which is a mixture of the thorium oxalate, Th(C2O4)2 and the calcium oxa
How can calculate the purpose of using the brine in the experiment, in a lab we completed a reaction, and then washed the ether layer with brine.
Discuss what mass of AlBr3 will be formed if 1.00 gram of Al totally reacts with the excess Br2? Aluminum will react with the bromine (Br2) to produce AlBr3.
When 1.00 gram of Compound D is totally combusted, 0.735 g H2O and 0.900g CO2 are collected. Calculate the complete empirical formula of compound D.