Which of the following is an example of an addition reaction? a. 2H2 + O2 -> 2H2O

b. BaSO4 -> Ba2+ + SO42-

c. C3H8 + 5O2 -> 3CO2 + 4H2O

d. 4NH3 + 302 -> 2N2 + 6H2O

e. 2NaHCO3 -> Na2CO3 + CO2 + H2O

h let me think

plants need sunlight, water, and carbon dioxide to make food. plants use the raw materials of water, nutrients they absorb from soil, and carbon dioxide to make sugars the plant can use. energy from the sun and chlorophyll are also needed.

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

here are some of the ways in which chemical and nuclear reactions differ.

explanation: