can i get some help with my prelab HEAT OF COMBUSTION Lab I. The Law of Conserva

Question

can i get some help with my prelab

HEAT OF COMBUSTION Lab I. The Law of Conservation of Energy can be applied to combustion processes where fuel oxygenproductsenergy The total chemical energy associated with the reactants must be the same as the total chemical energy of the products when the heat of combustion is included a) Underline the graph which best represents the relationship between the stored chemical energy of the reactants and products in a combustion process Reactants Products Reactants Products b) The difference in length of the bars on the correctly chosen graph represen the heat of combustion. Show this by using a vertical arrow on the graph c) The following represent the combustion of one mole of the potential fuels methane (CH) and methanol (CH,OH). They form a common set of products. CH4()202 ()CO2 2H0803 kilojoules CH,OHo 3/2 02 () CO2 ) 2 H0 (B) 639 kilojoules Circle the reaction where the reactants have a larger chemical potential energy Does the presence of the oxygen atom and its chemical bonds (C-O, O-H) increase or decrease the chemical potential energy of methanol compared to methane (C-H)? ncrease decrease

Explanation / Answer

Q1

a)

initially, fuels hav elots of chemical energy "hidden" in its bonds, therefore choose high energy on reactants

after reaction, the energy is released as heat, so products have low energy,

choose right side image

b)

The arrow must be shown in the RIGHT side of the formula

c)

higher potential is clearly that of CH4, since it has higher enthalpy change

Typically, Oxygen presence implies oxidation.

Combustion is oxidation reaction, so methanol is already partially oxidized, will not be that high as methane, which is 0% oxidized

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