What is the density of a lego block that has 4 cm length, 2 cm width, 4.5 cm height, Mass 18 g.

density is

Explanation:

the volume of the block is 4 x 2 x 4.5 and that equals 36. Divide the mass by the volume and you get which is equal to 2 g per cubic centimeters

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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.