Given a chemical reaction, methane (ch4) burns in oxygen (o2) to produce carbon dioxide (co2) and water (h2o). which of these represent an unbalanced equation with the correct chemical formulas? . a.. ch4 + o2 co2 + h2o. b. ch4+ co2 o2 + h2o. c. co2+ h2o ch4+ o2. d. ch4 o2 + co2+ h2o

Answer : The correct option is A.

Explanation :

As per the question, in a reaction, two reactants (methane and oxygen) should be present on the left side of the right-arrow and two products (carbon dioxide and water) which are formed in the reaction should be present on right side of the right-arrow.

Therefore, the unbalanced chemical reaction will be,

c

explanation:

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