Hurry i’m

carbon burns with oxygen to produce carbon dioxide gas
which of these shows the correct chemical reaction?

a. c, o, co2

b. c+02 + co2

c. c+0=co2

d. co2 =c+0

B

Explanation:

C+O2=CO2

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