Which state of matter is this picture ?​

gas because of the separation between the molecules.

Explanation:

A = gas

Explanation:

Heres a trick you can use to remember if its a solid liquid or gas.

Solid= molecules that are tightly packed

Liquid= molecules that are slightly moving apart

Gas= molecules that are jumping like crazy

So in this case the answer would be a gas.

Hope this helps :)

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