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1) why does a soluble impurity reduce the melting-point range of a pure compound?
2) why is it advisable to run a mixed melting point determination on samples of two different compositions before concluding that two compounds are identical?
Chemistry, Academics
How many moles of magnesium ion are present in 5.25g Mg 3 (PO 4 ) 2 ?
What is the mass of NaOH present in grams, given that a 100. mL solution has a concentration of 0.125 M?
The combustion of naphthalene (C 10 H 8 ), which releases 5150.1 kJ/mol, is often used to calibrate calorimeters. A 1.05 - g sample of naphthalene is burned in a calorimeter, producting a temperature rise of 3.86 degrees ...
How many molecules of butane (C4H10) are contained in a 9.213 g sample? How many hydrogen atoms are contained in this sample?
As a distributor, Testa Produce doesn't have direct contact with the public. How might the company go about alerting consumers to its "green" initiatives?
A 44.0 g sample of an unknown metal at 99.0 o C was placed in a constant-pressure calorimeter of negligible heat capacity containing 80.0 mL water at 24.0 o C. The final temperature of the system was found to be 28.4 ...
Describe how to assign a Oxidation number from the text: The oxidation number of an atom in an elemental substance is zero. The oxidation number of a monatomic ion is equal to the ion's charge. Oxidation numbers for comm ...
It takes 37.8 mL of 0.2114 M NaOH to neutralize 19.3 mL of an oxalic acid solution with an unknown concentration. Calculate the actual concentration of this oxalic acid solution. Don't forget to look at the balanced equa ...
How many grams of nitrogen are found in 50.0 grams of potassium nitrate?
Q1: In your gravimatric analysis experiment, you weigh the precipitate of AgCl in a filtering crucible. You have to weight your filtering crucible first (three weighing measurement), then do the filtration. After drying ...
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