Questions asked by nikkii

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• How do you find the maximum mass of aluminium that can react with 0.5 moles of HCI? 2Al + 6HCI - > 2Al2Cl3 + 3H2
  
• How many aluminium atoms are present in 5.396 grams of aluminium? 2Al + 6HCI -> 2AlCl3 + 3H2
  
• 2.00 grams of a straight-chained hydrocarbon contains 1.68grams of carbon, the rest hydrogen. 1. Calculate the empirical formula of this hydrocarbon.?
  
• Under certain conditions of temperature and pressure, hydrogen gas and nitrogen gas react to form ammonia gas. Determine the mass of ammonia produced if 3.50 moles of hydrogen has reacts with 5.00 moles of nitrogen gas?
  
• What mass of sodium hydroxide is needed to prepare 2.0L of 0.25mol L-1 of NaOH solution?
  
• Which one of the following is a 1 molar solution?
  
• What volume of the #"0.8-mol L"^(-1)# aluminium nitrate, #"Al"("NO"_3)_3#, solution contains #"85 g"# of the solute?
  
• What happens in a dynamic equilibrium exits in a reaction?
  
• 100mL of 5mol L-1 nitric acid was added to excess copper. What mass of copper reacted? Cu +4HNO3 -> 2NO2 + Cu(NO3)2
  
• To determine the solubility of calcium hydroxide, a chemist took 25mL of a saturated calcium hydroxide solution and found that it reacted completely with 8.13mL of #0.102mol L^-1# hydrochloric acid?
  
• When ammonium chloride dissolved in water the temperature decreases. The energy change for the dissolution of ammonium chloride is #+284Jg^-1# ?
  
• 50mL of 1 mole of HCI was added to 50mL of 1 mole NaOH. What temperature change would be noticed?
  
• Calculate the volume of carbon dioxide gas lost at 25 degrees and 100kPa?
  
• Which reagent is in excess?