What is role ping
and what is Human sitting motion​

look it up

Explanation:

role ping =Roles also allow you to selectively send alerts to players by role. Sending these alerts, which populate a little red “1” is colloquially known as a 'ping' because it's a privileged alert built to draw special attention to a Discord users. ... Finally, Roles allow users to categorically identify one another.

human sitting moon= Sitting Moon” refers to the crucial first month after giving birth when a mother should be nurtured and replenished with nutritious foods and herbs in order to regain their vitality and prevent post-labor illness. ..

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