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

i believe the answer is a.

"standard molar enthalpy:

h2o ( liquid water ) : - 285.8 kj/mole

h2o ( water vapor ) : - 241.8 kj / mole.

δhrxn = - 241. 8 - ( - 285.8 )= -241.8 + 285.8 = 44.0

answer: 44.0 kj"