Given the following heats of combustion. ch3oh(l) + 3/2 o2(g) co2(g) + 2 h2o(l) δh°rxn = -726.4 kj c(graphite) + o2(g) co2(g) δh°rxn = -393.5 kj h2(g) + 1/2 o2(g) h2o(l) δh°rxn = -285.8 kj calculate the enthalpy of formation of methanol (ch3oh) from its elements.

The standard enthalpy of formation of methanol is, -238.7 kJ/mole

Explanation:

The formation reaction of CH_3OH will be,

The intermediate balanced chemical reaction will be,

..[1]

..[2]

..[3]

Now we will reverse the reaction 3, multiply reaction 2 by 2  then adding all the equations, Using Hess's law:

We get :

..[1]

..[2]

[3]

The expression for enthalpy of formation of will be,

The standard enthalpy of formation of methanol is, -238.7 kJ/mole

answer

fusion: the energy source of stars. the energy released from the collapse of the gas into a protostar causes the center of the protostar to become extremely hot. when the core is hot enough, nuclear fusion commences. fusion is the process where two hydrogen atoms combine to form a helium atom, releasing energy.

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in chemistry, adhesion and cohesion are attractive forces that exist between molecules. they hold the molecules together from each other. they are different in that adhesive force exists between molecules of different substance while cohesive force happens between molecules of same substance.

adhesion between water and glass causes water molecules at the edge of water and glass interface to climb up the wall in a narrow glass tube. this is called capillary action. cohesion is what gives glass its shape and causes water to form a droplet.