While baking cookies, chemical reactions involve granulated sugar (sucrose) and baking soda (sodium bicarbonate). Use dimensional analysis and the conversion factors below to convert to grams. Your answers should contain the correct number of significant figures. given
1 cup granulated sugar = 7.05 oz
1 tsp baking soda = 0.212 oz
1 oz = 28.35 g
now
Convert 0.750 tsp of baking soda to grams.

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