Questions asked by Khalesi

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• Calculate ∆H°298 for each of the following reactions using suitable chemical data book.? 1. 3Zn(s) + Al2O3 ➡️ 2Al(s) + 3ZnO(s) 2. MgCO3(s) ➡️ MgO(s) + CO2
  
• Given ∆H° for the following reactions:H2(g)+O2(g)➡️2H2O(l):Cu(s)+1/2 O2(g)➡️CuO(s)_What further data is needed, if any,for calculation of ∆H° for the following reactions? CuO(s)+H2(g)➡️Cu(s)+H20(g)
  
• Alan, Betty and Carol are applying for three different jobs in a company. The probability that Alan gets his job is 0.5; the probability that Betty gets her job is 0.75; the probability that Carol gets her job is 0.3. Can anyone solve this?
  
• A box contains 100 copper plugs, 27 of which are oversize and 16 are under size. A plug is taken from the box, tested and replaced: a second plug is then similarly treated. Determine the probability that?