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A student performs twomelting point determinations on a crystalline product. In onedetermination, capillary tube contains a sample about 1-2 mm inheight and the melting point range is found to be 141-142C. In the other determination, the sample height is 4-5 mm and themelting range is found to 141-145C. Explain the broader meltingpoint range observed for the second sample. The reported melting point for the compound is 143C.
What mass of potassium chromate is needed to add to exactly 500g of water to produce a solution with vapor pressure of 21.50 torr at 24 C
which of the following statements about colligative properties of solutions is false?1. the higher the concentration of
Draw Lewis structures of the four molecules and/or ions with the formulas given below and figure out which two of these are isoelectronic with each another.
Given the following balanced chemical equation, how many mol of NaN3 can be formed if 2.50 mol of Na are allowed to react with 4.50 mol of N2? 2Na +3N2 --> 2NaN3
if 0.150 moles of salicylic and excess acetic anhydride are used during a synthesis of aspirin, how many grams of aspirin will be obtained if the reaction gives a 38% yield.
The Haber process is used in industry to produce ammonia from N2 and H2. A reactor contains NH3, N2, and H2 at equilibrium at 1000 K. The concentration of NH3 is 0.102 moles/liter, N2 is 1.03 moles/liter, and H2 is 1.62 moles/liter. Calculate the ..
At 1 atm, how many moles of CO_2 are released by raising the temperature of 1 liter of water from 20 celcius to 25 celcius
A first order reaction has a rate constant of 0.210 at 25 oC and 4.91 at 42 oC. Calculate the value of the activation energy in KILOJOULES
A sample of sodium reacts completely with 0.426 of chlorine, forming 702 of sodium chloride. What mass of sodium reacted?
What mass of CCl2F2 substance must evaporate in order to freeze 135 g of water initially at 15 degrees celsius? (The heat of fusion of water is 334 J/g the specific heat of water is 4.18 J/gK .)
What is the concentration of the potassium ion (in M) in a solution which contains 50.4 g potassium phosphate in 610 mL of solution
Calculate the pressure exerted by 1 mole of CO2 confined in 22.45L at 298K using van der waals
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