chemistry

Glauber's salt undergoes a phase transition according to the following equation:

Na2SO4*10H2O(s)--> Na2SO4*10H2O(l) ∆H = 74.4 kJ/mol

Calculate the mass (g) of Glauber's salt (use the masses to two decimal places found in the front of your text) needed to lower the temperature of air in a room by 5.6oC. The mass of air in the room is 551.8 kg; the specific heat of air is 1.2J/g-C.

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asked by lynn
  1. q = mass air x specific heat x delta T.
    Calculate q. Watch the units.
    From the kJ q needed, convert to moles of the salt and from there to grams. Post your work if you get stuck.

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    posted by DrBob222

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