C) Gather the materials that you will need to complete this project. Step 2: Draw a model of water in each state of matter.
a) You will use water as the subject of your poster. Start by drawing a representation of three
sealed containers.
b) In the first container, draw a representation of water molecules in a solid (ice). Be sure that
your model represents water at the molecular level. You may use a single circle to represent a
water molecule, rather than showing the individual atoms within the molecule.
c) Following the same method, draw a representation of water molecules in a liquid in the
second container.
d) Finally, draw a representation of water molecules in a gas (water vapor) in the third container.

a 20-cm-long, cylindrical graphite (pure carbon) rod is inserted into an oxidizing atmosphere at 1145 k and 1.013 x 105 pa pressure. the oxidizing process is limited by the diffu- sion of oxygen counterflow to the carbon monoxide that is formed on the cylindrical surface.

answer : third trial had the contaminated sample and the correct value for dhrxn should be 1000 kj/mol

explanation :

let us write down the given equations

equation 1 :

equation 2 :

equation 3 :

let us use hess's law to find out which 2 equations can be added to get the third equation.

let us reverse equation 2 and multiply it by 2. the new equation that we get is,

equation 4 :

let us add equation 1 & 4

the above equation is similar to equation 3 but has different value for dhrxn.

therefore third trial had the contaminated sample and the correct value for dhrxn should be 1000 kj/mol