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What is the mole fraction of helium, XHe, in a gaseous mixture of He and Ar for which the average molar mass is found to be 8.75g/mol?
If 60.0g of Cu metal at 85C were added to 60.0g ethanol at 10C in a calorimeter of heat capacity 30.0 J/K what would the final temperature be assuming no heat losses? cp for Cu= 0.380 J/K/g and Cp for ethanol = 60.0 J/K/mol
a sample of nitrogen gas in a 4.7-l container at a temperature of 28degc exerts a pressure of 3.6 atm. calculate the
The activation energy of the orginal pathway is 106 KJ/mol. What is the activation energy of the new pathway, all other factors being equal?
A restriction enzyme has a recognition seuence between G and C in a palindrome. Show the products of the followling double stranded DNA upon treatment with the enzyme
What is the probability that the particle is in the left quarter of the box for n=1?, n=2?, n=3?
Is a first order rate constant of 3.14x10^-4 1/s at room temperature, if you currently have a 2.5 M N2O5 how long will it take for 65% of N2O react?
What is the equilibrium pH of the solution? Solve by graphical method (draw a log C -pH graph and label the pertinent info, show your charge balance for the equation)
Calculate the grams of HCl that must be diluted to a volume of 1 liter to produce a concentration of 0.5M. Calculate the normality of 1 L of solution containing 45grams of NaOH.
If you had excess chlorine, how many moles of of aluminum chloride could be produced from 29.0 of aluminum
question 1. a solution of 0.100 m acetic acid is prepared.a what is its ph value?b if 20 of the initial acetic acid is
An aqueous solution of methylamine (CH3NH2) has a pH of 10.68. How many grams of methylamine are there in 100mL of the solution
A reaction takes place inside a constant pressure calorimeter. The heat absorbed by the calorimeter is measured to be +15J.
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