Plz help 11. Jack placed his new birthday helium balloon into the freezer. Will the balloon expand or shrink?
Describe what would happen to the helium gas particles. Be sure to include information about the gas
particle movement, volume (space between particles), and pressure.

The balloon will shrink bcuz the average kinetic energy of the helium gas particles in the balloon decreases when the temp decreases. This makes the molecules move more slowly and have less frequent and weaker collisions with the inside wall of the balloon. The pressure will also decrease bcuz air pressure is the total force per unit area

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