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A solution is made by dissolving 104.9 grams of sodium thiocyanate (NaCNS(s)) in enough water to make 1.000 L of solution at 20.0oC. The density of this solution is found to be 1.0491 g cm-3. the concentration of this solution in mass % is 9.9990. the molarity of this solution is 1.3M. the molality of this solution is 1.38m.
a) Calculate the mole fractions of sodium thiocyanate and water in this solution.
How fast must a 50.2-g tennis ball travel to have a de Broglie wavelength equal to that of a photon of green light (5400 Å).
The half-life of a certain first-order reaction is 15 minutes. What fraction of the original reactant concentration will remain after 2.0 hours
The pressure on a balloon holding 350 mL of an ideal gas is increased from 254 torr to 1.00 atm. What is the new volume of the balloon (in mL) at constant temperature?
1. What problem occurs if a student turns off the aspirator before detaching the tubing at a connecting point? 2. What criteria should you use to determine whether recrystallization or sublimation will be a better method of purification?
Suppose Joule encountered the waterfall at Niagara Falls. Calculate the height if the temperature difference between the top and bottom of the waterfall is 0.20° F.
Acetylene (C2H2) can be produced from the reaction of calcium carbide (CaC2) with water. Draw the localized electron orbital model (hybridized orbital model) for the acetylide anion (C22-), showing ?, ?, and lone pair electron orbital.
Assume that an esterification reaction is done using 0.10 moles of a carboxylic acid and 1 moles of an alchohol. What is the theoretical yield (in moles) for the reaction
In no less than one hundred words How would you go about remedying a situation where less than optimal quality of (human) resources
Question- How much heat is required to warm 1.70L of water from 22.0?C to 100.0 ?C? (Assume a density of 1.0g/mL for the water.)
gold forms a substitutional solid solution with silver. compute the number of gold atoms per cubic centimeter for a
Hexane has a negligible absorbance above 200nm. S sample of Hexane containing 20.0 mg/L of an aromatic compound (MW=114.3 as impurity had an absorbance value of 0.351 at 254 nm in a 2.00 cm pathlength cuvet
The gas pressure in an aerosol can is 1.8 atm at 25 degrees celsius. if the gas is an ideal gas what pressure would develop in the can if it were heated to 475 degrees celsius?
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