When two objects with different thermal energies are placed together, energy will start to flow between them. When does this energy stop flowing? (1 point)
The energy will stop flowing when the warmer object has lost all of its thermal energy.
The energy will stop flowing when the warmer object has absorbed all of the thermal energy.
The energy will stop flowing when the temperature of the colder object is significantly less than that of the warm object.
The energy will stop flowing when the two objects reach the same temperature.

chemistry sucks a**

explanation:

indium, and thallium have three electrons i think

the enthalpy of formation of water is given as -285.8kj/mol, which states that the enthalpy of formation is negative.

negative enthalpy of formation indicates that the heat is released during the reaction process. the heat is released from reaction to the surroundings the enthalpy is expressed with a negative sign with the energy given out in the reaction process.

the formation of water takes place by giving out heat which is -285.8 kj/mol.

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