<p>Well then, I need help...(easy for you, challenging for me)</p>
<p>1.- When a large amount of ammonium chloride is added to water at 25 Celsius, some of it dissolves and the temperature of the system decreases. Predict how the enthalpy changes in the system during the process. Explain the basis for your prediction.(need help)</p>
<p>2.-Propane, C3H8, is a hydrocarbon that is commonly used as fuel for cooking.
a)Balanced EQ: C3H8 + 5O2 --> 4H2O + 3CO2 (I did this)
b)Heat of formation: -(-2220.1+0)+(4(-285.3)+3(393.5))= 2259.4 kj (I did this)
c) Assuming that all of the heat evolved in burning 30 gr. of propane is transferred to 8kg of water (specific heat-4.18 J/g*C), calculate the increase in temperature. (need help)</p>