Two students are working together on a project. One student applies for to a book to move it across the table to the other person. Student 1 applies the force of 20 N to push the book to student 2. If the force of friction resisting is 4, what is the net force acting on the book. A. 6 N
B. 10 N
C. 24 N
D. 16 N

the enthalpy of formation of water is given as -285.8kj/mol, which states that the enthalpy of formation is negative.

negative enthalpy of formation indicates that the heat is released during the reaction process. the heat is released from reaction to the surroundings the enthalpy is expressed with a negative sign with the energy given out in the reaction process.

the formation of water takes place by giving out heat which is -285.8 kj/mol.

50.23 i believe is correct but don't quote me on that.