Winter is coming and its time to make sure uou have the right amount of antifreeze in your car. The best mixture of antifreeze and water is 50% antifreezs with 50% water. The cooling system in your car has a mixture of 6.00 L water with 6.00 L of ethylene glycol (antifreeze). What is the molality of that solution? The chemical formula for ethylene glycon is c2h602 and its density is 1.1132 g/cm3. (Hint- use the density to find the mass of 6.0 L of c2h6o2, and remember that 1.0cm3 = 1.0 mL and that 1.0 L of water = 1.0 kg)

(b) which contains higher levels of vitamin b, oranges or spinach?

explanation:

you can eliminate a, c, and d because they are questions based on opinions.

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