Someone help me please i’ll give

Convection

Explanation:

▶ Convection is the transfer of heat through a gas or a liquid. The gas in this case would be the air passing through the heat and moving in a large quantity that then heats the hair.

It may be all of the above since the hair dryer is using both convection and conduction produce hot air but it says clearly so im assuming its Convection.

is appreciated! Hope I helped!

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