What happens to the potential energy of the atoms during a phase change? O The potential energy of the atoms increases,
O The potential energy of the atoms decreases,
• The motion of the atoms stops.
The potential energy of the atoms remains the same

the product of the pressure and volume is also constant

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

answer7,570,82356 cubic centimeters;