Reviewing Thermochemistry: First Law of Thermodynamics and Enthalpy Methanol is

Question

Reviewing Thermochemistry: First Law of Thermodynamics and Enthalpy Methanol is combusted to provide heat. The reaction and the enthalpy for the reaction are shown below CH3OH(l) + 1.502 (g) CO2 (g) + 2H20(1) Al--715 kJ Below is a list of sentences that describe a chemical reaction. Choose all of the sentences that apply to the above reaction Check all that apply. This process is endothermic. The enthalpy for 2CH30H(I) + 302 (g)- 2CO2 (g) + 4H20(1)s-1.430 kJ This process is exothermic The enthalpy for 2CHsOH(l) + 3O2(g) 2CO2 (g) + 4H20(1) is 1.430 kJ The enthalpy for 2CH30H(g) + 3O2(g) 2CO2(g) + 4H20(1) is-715 kJ The enthalpy for 2CH3OH(I) + 302 (g) 2CO2 (g) + 4H20(1) 715 kJ 2 This chemical reaction transfers heat from the surroundings to the system This chemical reaction transfers heat from the systern to the surroundings. Submit x Incorrect, Try Again; 3 attempts remaining A reaction that absorbs heat has a 11 > 0 and is endothermic

Explanation / Answer

(b)

The enthalpy of 2 CH3OH + 3 O2 --------> 2 CO2 + 4 H2O is - 1430 kJ ( 2 * deltaH = 2 * 715 = 1430)

(c)

The reaction is exothermic

(h)

The chemical reaction transfers heat from system to surroundings.

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