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How many moles of urea (60. g/mol) must be dissolved in 100 g of water to give a 2.5 molal solution?
A sample of gas occupies a volume of 115mL at a pressure of 720. mmHg. Calculate its volume at STP.
1.202 g of a solid white acid are dissolved in water and completely neutralized by the addition of 35.26 mL of 0.482 M NaOH. Calculate the molar mass of the acid, assuming it to be a monoprotic acid.
can you find out the name and formula of the unknown compound and determine the identity of the element?
Consider 4 L of a buffer composed of 2 M HCN and 3 M NaCN? How many moles of strong acid could this buffer withstand?
calculate the micrograms (to the nearest microgram) of iodine per serving in the finished product. Show your work.
A piece of copper with a mass of 218 grams has a heat capacity of 83.9 J/degrees C. What is the specific heat of copper.
A 4.40 g piece of solid CO2( dry ice) is allowed to vaporize(change to gas) in a ballon. The final volume of balloon is 1.00 L at 300L. What is the pressure of the gas?
Calculate the enthalpy change in kJ when 19.1g of H2S is burned. 2H2S(g) + 3O2(g) --> 2SO2(g) + 2H20(g) Change in H= -1036kJ/mol
How much heat is absorbed when 45.00 g of C(s) reacts in the pressence of excess SO2(g) to produce CS2(l) and CO(g) according to the following chemical equation?
Two particles with charges q1 and q2 are separated by distance d. Rank these scenarios according to the magnitude of the electrostatic (coulombic) potential energy.
A sample of an unknown gas effuses in 10.5 min. An equal volume of H2 in the same apparatus under the same conditions effuses in 2.07 min. What is the molar mass of the unknown gas?
A mixture of KBr and NaBr weighing 0.560 gm was treated with aqueous Ag+ and all the bromide ion was recovered as 0.970 gm of pure AgBr. What was the fraction by weight of Kbr in the original sample?
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