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Calculate the change in entropy when 25 g of ethanol at 50oC is poured into 70 g of ethanol at 10oC in an insulated vessel given that Cpm = 111.5 J/Kmol
What should be the normality of a sodium hydroxide solution if exactly 25.00ml are to be used to titrate 25.00of a vinegar sample containing 4.80% acetic acid
How many possibilities are there to assort the billiard balls in a line (include the (white) cue ball)? How many possibilities are there to arrange 6 red and 6 yellow balls in a line?
A cylinder contains 250 g of Helium at 200 K. The external pressure is constant at 1 atm. There is an increase in temperature of 56 K. Calculate the heat lost or gained by the system in response to this change in the external temperature.
a solution is made by dissolving 26.42g of nh42so4 in enough h2o to make 50.00ml of solution.a. what is the molar mass
equal volumes of water density 1.00gml and ethyl alcohol density 0.789gml are combined. if the total volume is 190 of
a certain nitrogen-oxygen compound contains 36.84 n by mass and the remainder is oxygen. what is the empirical formula
Knowing that air contains 21% O2 and 79% N2 by volume, calculate the initial partial pressures of O2 and N2.
Calculate the mass of oxygen per gram of sulfur for sulfur dioxide. B) Calculate the mass of oxygen per gram of sulfur for sulfur trioxide.
What is the sum of the coefficients in the balanced equation that represents the complete combustion of the relatively new
A sample of calcium carbonate absorbs 45.5 J of heat upon which the temperature of the sample increases from 21.1 degrees celcius to 28.5 degrees celcius.
The specific heat of the reaction mixture was 4.104 Jg-1 K-1 and its density was 1.03 g mL-1. The calorimeter constant was 3.36 J K-1. Calculate delta H neutzn for reaction of NH3 and acetic acid.
what kind of precautions need to be taken when working with grignard reagents? in addition which of the following types
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