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How many total moles of ions are released when each of the following samples dissolves completely in water?
(a) 0.342 mol of K2HPO4
(b) 6.77 g of MgSO47 H2O
(c) 6.594 1021 formula units of NiCl2
How many grams of sodium azide, NaN3 are needed to react by the equation below in order to inflate a 50.0: air bag with N2(g) at 298K and 1.20 atm? NaN3(s) -------> Na (s) + N2
We use Use the De Broglie wavelength formula, ohr radius definition and wave-particle duality equation to compute the wavelength of,
Gold has a face-centered cubic structure and has a density of 19.3 g/cm3. What is its atomic radius?
Calculate the activity and activity coefficient for ethanol in this solution. c. Calculate ?mixG for a solution that contains 0.12 moles of ethanol and 0.83 moles of chloroform at 35.0 oC.
What is the work done in terms of the system?
Calculate the number of mmoles of primary standard grade Na2CO3. b. How many mmoles of HCl reacted with the Na2CO3? c. Calculate the molarity of the HCl solution.
elements from lanthanum to lutetium, As the atomic number gets larger, the atomic radius be same or decreased. How do you account for this general trend
a sample of gas has a mass of 38.8 mg. it's volume is 224 mL at a temperature of 55 degrees C and a pressure of 886 torr. Find the molar mass of the gas.
Calculate the pH at the points in the titration of 40.00 mL of 0.425 M NH3 for the reaction below. NH3(aq) + HNO3 ? NH4+(aq) + NO3?(aq) For NH3, Kb = 1.8x10-5.
When 2.45 g of an unknown weak acid HA with a molar mass of 85.0g /mol is dissolved in 250.0g of water, the freezing point of the resulting solution is -0.256 C.
32.5 kjmoldeggd muscles are powered by the hydrolysis of adenosine tri phosphate to adp pi which has a gacute for this
calculate the concentration in mol/L and mg/L of a solution prepared by adding 4.00 mL of a 8.26 x 10^-4M stock solution of Allura Red to a 100.00 mL volumetric flask and then filling to the mark with DI water.
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