Ch4 + cl2 -> ccl4 + hcl what element has subscripts 4?

Hydrogen and chlorine.

Explanation:

The balanced chemical equation is

CH₄ + 2Cl₂ ⟶CCl₄ + 4HCl

Two elements in the equation have the subscript 4.

The element H (hydrogen) in CH₄ is one of them.

The element Cl (chlorine) in CCl₄ is the other.

56 moles of   lieter in chemistry

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.