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If 250mL of methane, CH4 effuses through a small hole in 48 s, the time necessary for the same volume of helium to pass through the hole will be?
Compound A is a water-soluble liquid that gives positive 2,4- dinitrophenylhydrazine and iodoform tests and a negative Tollens test. The IR spectrum of A has bands at 2950, 1720 and 1370 cm-1.
The heat of vaporization of water is 40.66 kJ/mol. Assuming sweat is 100% water, how much heat is removed from your body through the evaporation of 3.13 g of sweat?
Calculate [OH] for a solution formed by adding 5.00 mL of 0.140M KOH to 15.0 mL of 9.0×10-2M Ca(OH)2.
determine the mass of aluminum acetate that can be made if you do the reaction with 125 grams of acetic acid and 275
What are the Kb and pKb of a 1.06 *10^-3 M solution of quinine, a drug used in treating malaria, having a pH of 9.75? I calculated and got: Kb = 2.95*10^-17, and pKb = 16.5.
Some solution has an H+ concentration of 10^-10 M. if this solution could be diluted so its new H+ concentration is now 0.01 of the original. what would be the new H+ concentration in M and new pH
Complete and balance the following neutralization reaction, name the products, and write the net ionic equation.
determine the final pressure volume temperature and number of moles of gas when the volume is reduced by halfnbspat the
What volume will it occupy at each of the following temperatures if the pressure and number of moles are constant
It was found that 19.31 mL of an HCl solution are needed to react completely with 322 mL of a LiOH solution that has a pH of 11.56. What is the molarity of the HCl solution?
Select the more polar bond in each of the following pairs: a) C-C or C-O; b) P-Cl or P-Br; c) Si-S or Si-Cl; d) F-Cl or F-Br; e) P-O or P-S.
Phenolphthalein is an acid base indicator. What color does it possess in the presence of excess hydrogen (i.e., hydronium) ions?
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