5 of 6
For every 1 litre of water used to make
a medicine, 17ml of sucrose and 83ml
of sáline solution are used. Express
the amount of water, sucrose and
saline solution needed as a ratio in its
simplest form.
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® 100.43

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