During an experiment to produce H2O vapor, a student collects the following data: Pressure=719.2 mmHg, Volume=66 mL, Temperature=27.0 C. How many
moles of water vapor are produced? *
O 6.7 X10-1 mol
2.5 x 10-3 mol
0 3.5 x 10-1 mol
8.6 x 10-2 mol

I need help on how to also tell what equation to use in a question

hurricanes form when warm, moist air from the ocean surface quickly rises into the atmosphere and forms storm clouds and rain. when the clouds are formed, heat is released which warms the cool air in the upper regions of the atmosphere so that the cycle can continue. which two phases of the water cycle are repeated in this process?

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