The enthalpy change for the following reaction is -483.6kJ 2H2+O2 → 2H2O

Therefore the enthalpy change for the following reaction is:
2H2+O2 → 2H2O

The fact that the total amount of energy in a system remains constant is a(n)

How does carbon monoxide pose the greatest threat to humans? a. it can be produced by wood fires. b. it can be produced by home furnaces. c. it is produced by acid rain. d. it is produced by modern automobiles.

In what way do investigations build scientific knowledge? the results of investigations lead to questions that cannot be tested. they reflect the opinions and social values of scientists, ensuring valid information. the results of investigations lead to new questions, which lead to new investigations. they are not influenced by the research of earlier scientists, so they are able to address gaps in understanding.i