Classify each process according to direction of heat flow.
Evaporation of alcohol from skin: liquid C3H2O + 5.2 kJ → vaporized C3H30
Burning of propane in a gas grill: C3H8 + 502 — 3CO2 + 4H2O + 1652 kJ
Oxidation of iron to form rust: 4Fe + 302 → 2Fe2O3 + 2221 kJ

heat flows in

heat flows out

heat flows out

Explanation:

"you start with 15.67 g mgco3-xh2o, when heated and all the water is removed, you are left with 7.58 g mgco3 only.

therefore, you had 15.67 - 7.58 = 8.09g h2o  

moles of each :

7.58g mgco3 = ? moles = 7.58g / 83.4g/mole = 0.09moles  

8 09g h2o = ? moles = 8.09g / 18g/mole = 0.44moles  

molar ratio between the two by dividing both numbers by the smallest number :

0.09 / 0.09 = 1  

0.44 / 0.09 = 4.8  

mgco3-5h2o"

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