Drag each tile to the correct location. Several properties of water are shown. Classify each property as a physical property or a chemical property.
can be split into hydrogen and oxygen
is liquid at room temperature
has a density of 1.0 g/cmº
reacts with certain metals
Physical
Chemical

b. is the answer hoped i        

i think its 100.

hope this !

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