Students are making a scale model of the solar system they make mercury 1 cm in diameter. What are the best estimate for the skilled size of earth and Neptune? Move the best estimate into the table

passing a magnet thought the

mixture , because iron gets attracted to magnet .

b) nuclear ive learned that in a pedtrodic table

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