crystine cole

Most popular questions and responses by crystine cole
  1. chem

    calculate the change in enthalpy when 1.00g of hydrogen peroxide decomposes. H2O2(l) yields H2O(l)+ 1/2O2(g) (traingle)H- -98.2kj I will be happy to critique your thinking on this. help me? You know the delta H is for one mole decomposition. So figure the

    asked on April 12, 2007
  2. chemistry

    what is the percentage of water in the hydrate (Na2Co3)(10H20)? step by step and solution please? big quiz today!! step1. find the mol mass of Na2CO3 2) find the mol mass of H2O percent water= [10*molmassH2O / (molmassNa2CO2 +10*molmassH2O) ] *100

    asked on April 12, 2007
  3. chemistry

    how much thermal energy is needed to raise 500.0g of H2O at 50.0*C to steam at 100.0*C? step by step solution and answer!!???!! answer? You have to be kidding. Are you taking a quiz and want to turn it in? Goodness. Find the heat in each of the following.

    asked on April 12, 2007
  4. chemistry

    what is the thermal energy change as 175.0g, of water drops from 75.00 dgrs C to 15.50 dgrs C??? q = mass H2O x specific heat water x (Tfinal - Tinitial). mass H2O = 175.0 g specific heat water = 4.184 J/g*C Tf = 15.50 Ti = 75.00 Solve for q. Check my work

    asked on April 11, 2007
  5. thermochemistry

    what is the mass of a lead block that if heated to 100.0 dgrs C and placed in a container with 50.0g of ice at 0.00dgrs C produces a final water sample of 15.0dgrs C? Sh of Pb= 0.128J/g dgrsC step by step solution and answer q1 for Pb block = mass x sp.h.

    asked on April 11, 2007