A wood block measures 3cm in length, 4cm in width, and 5cm in height. The block has a mass of 180 grams. What is the block's density?

Finding volume:

V(wood)=l×b×h=3×4×5=60cm³

we have been given the mass of the wood as 180 grams and we know that"

Density = mass/ volume

substituting in the mass and volume

=> D=180/60=3g/cm³

20 drops hope this

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.