Convert to standard notation. 1.312 x 10^2

The answer would be 131.2

Explanation: How I got my answer is quite simple. In order for it to turn into standard notation, it would need to be turned into the answer of an equation. The equation here would be "1.312 x 10^2". 10^2 would be 100. Multiply 100 by 1.312 will make the decimal point move 2 times to the right, so it will end up in front of the 2. That would make the answer 131.2

I hope this info helps! :P

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