Which way of moving molecules across a membrane requires energy?

Active Transport

Explanation:

When energy is needed, the movement is known as active transport. Active transport moves molecules against their concentration gradient, from an area of low concentration to an area of high concentration.

the movement of molecules across a membrane without the input of energy is known as a passive transport. When energy (ATP) is needed, the movement is known as active transport.Active transport moves molecules against their concentration gradient, from an area of low concentration to an area of high concentration.

Explanation:

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.