Cliff hanger smokes 1 pack of cigarettes per day. how many cigarettes will be smoke in 7 years of smoking at that rate? (1 pack =20 cigarettes)

50 960 cigarettes. If Cliffhanger smokes 1 pack of cigarettes per day, he will smoke 50 960 cigarettes in 7 years.

We use the factor label method to convert

years → weeks → days → packs → cigarettes

No of days = 7 yr x (52 wk/1 yr) x (7 days/1 wk) = 2548 days

No. of packs = 2548 days x (1 pack/1 day) = 2548 packs

No. of cigarettes = 2548 packs x (20 cigarettess/1 pack) = 50 960 cigarettes

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