2. Calculate the mass of solvent in grams in a solution containing 3.0 grams of Tylenol
if the mass percent is 3.5%.

Explanation:

1, Formula

2. Determine mass of solution

Substitute the data and clear the mass of solution:

3. Determine the mass of solvent:

Round to two significant figures: 83 g

the answer is option a.

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