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The purity of a substance will often affect the melting and boiling points. This is used by chemists to assess the purity of a product. How does the purity of the substance affect the melting and boiling points?
the half life of polonium-210 is 138.4 days. how many milligrams of polonium-210 remain after 415.2 days if you start
When 0.250 grams of a polymer were dissolved in 22.9 mL of benzene at 21.6 degrees C, the osmotic pressure was found to be 0.044 atm. Calculate the molar mass of the protein.
Explain what is the net ionic equation for the reactions that take place when HCl and NaCl are added to the buffer CH3COOH + NaOH = NaCH3COO + H2O
Problem- A solution of hydrochloric acid of unknown concentration was titrated with 0.28 M NaOH. If a 100.-mL sample of the HCl solution required exactly 10. mL of the NaOH solution to reach the equivalence point, what was the pH of the HCl soluti..
an aqueous solution of glycerol c3h8o3 is 48 glycerol by mass. calculate the molality of the glycerol solution. please
Find the solution of the system of equations and . Give the x value followed by the y value, separated by a comma. Express your answer in the form x,y
we can see that the amount of heat released is 1679.5 \rm kJ per mole of methane, or 1679.5 \rm kJ per four moles of fluorine. How much heat is released per mole of fluorine
An oxygen tank contains oxygen at a pressure of 70 kPa. When the pressure drops to 36 kPa, the temperature increases from 300 K to 350 K. If the initial volume is 9 L, what is the final volume?
Creatine is a by-product of muscle metabolism, and creatinine levels in the body are known to be a fairly realiable indicator of kidney function.
Draw the Lewis structures for each of the following molecules or ions. Which do not obey the octet rule? (a) NO, (b) BF3, (c) , (d) OPBr3 (the P is the central atom), (e) XeF4
If 15.68 grams of oxygen gas as well as 7.60 grams of helium gas are both added to a 5.00 L SCUBA tank at room temperature, explain what will be the total pressure in the tank assuming ideal behavior
Calculate the percent of volume that is actually occupied by spheres in a face-centered cubic lattice of identical spheres. You can do this by first relating the radius of a sphere,r
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