Questions asked by xloxias

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• When 20.0 g of sodium fluoride is dissolved in water to prepare the total volume of 200.0 mL solution, what is the molarity of the solution?
  
• Zinc metal reacts with HCl solution to produce ZnCl2 and H2 gas. What is the volume (in mL) of 0.470 M HCl is required to react with 0.15 g of Zn metal?
  
• When 1.045g of calcium oxide is added to 50.0mL of water at 25.0°C in a calorimeter, the temperature of water increases to 32.3°C. Assuming density of solution is 1.00g/mL and a specific heat capacity of 4.19J/g˚C?
  
• Why is ethanol able to mix with both water and gasoline (octane) but gasoline and water do not mix?
  
• How many alkene structural isomers does the molecule below have? The molecule below counts as one isomer.
  
• How many structural isomers does the molecule below have? The molecule below count as one isomer.
  
• What would the molecule below be classified as?
  
• How many moles of sodium carbonate is present in a 325 mL solution with a molar concentration of 0.620 M?
  
• Hydrobromic acid dissolves solid iron according to the balanced equation: Fe(s) + 2 HBr(aq) → FeBr2(aq) + H2(g) How many grams of H2 would be produced by dissolving 6.31g of iron?
  
• You are titrating a solution of sodium hydroxide of unknown concentration with 0.500 M of phosphoric acid. It required 16.4 mL of H3PO4 solution to neutralize 10.0 mL of NaOH solution. Calculate the molar concentration of sodium hydroxide solution?
  
• State whether the following processes are endothermic or exothermic and explain why?
  
• Hess' Law can be said to be a consequence of the Law of?
  
• An iron nail with a mass of 1.365 g is soaked in an acidic solution, yielding Fe2+ solution, which is then titrated with 26.48 mL of KMnO4 solution in the following equation: Calculate the molar concentration of the KMnO4 solution?
  
• Formic (or methanoic) acid is a weak acid secreted by ants as a defence mechanism. The acid has a Ka value of 1.8 x 10-4. What is the pH of a 1.65M solution of formic acid?
  
• HA is a weak acid. A 0.21M solution of HA has a pH of 2.68. What is the Ka value for HA?
  
• Calculate the pH at which bromocresol green indicator would be 50% in its yellow form and 50% in its blue form?