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a student was asked to determine the purity of a contaminated sample of ammonium chloride.a sample of 5g was warmed with 100cm^3 of Noah.after all the ammonia was driven off,the excess Noah required 25cm^3 of 0.5mol/dm^3 sulfuric acid for neutralization.calculate the purity of the ammonium chloride in the sample.
A weather balloon at Earth's surface has a volume of 4 L at 285 K and 791 mmHg. If the balloon is released and the volume reaches 4.19 L at 711 mmHg.
While shutdown, the core accidentally went critical and the reactor pressure vessel rose in temperature and was hot for two hours, but all instrumentation has failed and no one is sure what the temperature was.
A student was given a standard Fe(s) | Fe2+(aq) half-cell and another halfcell containing an unknown metal M immersed in 1 M MNO3(aq).
what is the minimum amount of ice at 0C that must be added to the contents of a can of diet cola (340mL) to cool it from 20.5C to 0C?
Chlorine was previously identified as a catalyst in the breakdown of ozone into oxygen gas. Using the enthalpy of reaction for two reactions with ozone, determine the enthalpy of reaction for the reaction of chlorine with ozone.
Consider the reaction that will take place between (S) -2-bromobutane and sodium azide in DMF. A) What is the product of this reaction (give proper stereochemistry of the product formed)
Small helium-neon lasers emit 1.51 mJ/s of light at 634 nm. How many photons does such a laser emit in one minute?
170mL of an HCl solution with pH of 2.80 is added to 200mL of an HNO3 solution. The resulting pH is 1.40. What was the pH of the original HNO3 solution
A 0.456 gram sample of an unknown monoprotic acid (lets call it HZ) was dissolved in some water . Then the acidic solution was titrated to the equivalence point with 32.5 mL of 0.174 M KOH.
An electrophilic addition is? Answer . a) An addition to an alkene initiated by a nucleophilic attack. b) An addition to an alkene initiated by an electrophilic attack
What is the theoretical yield of aluminum oxide if 2.40 of aluminum metal is exposed to 2.10 of oxygen?
An aqueous solution contains 4.20% NH3 (ammonia) by mass. The density of the aqueous ammonia is 0.979 g/mL. What is the molarity of NH3 in the solution?
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