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Calculate the molarity of a solution made by adding 21.7 mL of concentrated potassium hydroxide (34.5 % by mass, density 1.46 g/mL) to some water in a volumetric flask, then adding water to the mark to make exactly 2000 mL of solution. (It is important to add concentrated acid or base to water, rather than the other way, to minimize splashing and maximize safety.)
What is the heat change in J associated with 74 g of gaseous butane at 91 oC changing to solid at -170 oC? c(butane) (gas) = 2.31 J/ (g.K) c(butane) (liq) = 1.65 J/(g.K) c(butane) (s) = 1.32 J/ (g.K) ?Hfus(butane) = 6.885 kJ/mol
Calculate Ea. Express your answer using two significant figures Ea= kJ/mol Calculate A. Express your answer using one significant figure. A = M-1s-1
If the two flasks are connected through a stopcock and the stopcock is opened, what is the partial pressure of helium?
A 1.20 gram sample of dry ice is added to a 755mL flask containing nitrogen gas at a temperature of 25.0 degrees Celsius and a pressure of 725 mmHg. The dry ice is allowed to sublime and the mixture is allowed to return to 25.0 degrees Celsius. wh..
Calculate the empirical formula and then determine the molecular formula of this compound using the given molar mass. b) Draw three lewis structures for molecule that satisfies the octet rule for each atom.
How many grams of lithium are required to completely react with 60.7 mL of N2 gas at STP?
when liquid water is put into an evacuated vessel at 25 celsius what is the sign of the change in enthalpy, entropy, free energy, and temperature for the system during this process?
If you start with 15.0 of a 0.900 solution of , and then dilute it with water to 270 , what is the concentration of at equilibrium?
Active ingredient in household bleach is NaOCl. Find % concentration (w/v) in household bleach. (Mass of NaOCl per mL of solution) *Atomic mass of NaOCl = 74.44217 Question 2: Using the % w/v of NaOCl on the bleach bottle, calculate the percent er..
Draw the radial probability distribution function of a 8f orbital. And may you please explain what a radial probability distribution is and how to draw one for any orbital? Thank you!
NiCl2(aq)+ 2NaOH(aq)---> Ni(OH)2(s)+ 2NaCl(aq) how many grams of Ni(OH)2 are produced from the reaction of 35.0 mL of a 1.75M NaOH solution and excess of NiCl2.
Determine the final concentration if A 129 mL portion of that solution is diluted using water of 149 mL.
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