All matter has both physical and chemical properties. A physical property can be observed without changing the identity of the substance. Which is a physical property? A. ability to rust
B. density
C. flammability
D. reactivity with the water

"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"

did anyone actually do this? like if anyone has submitted this i rly need .

plasma is the state of matter where the substance is ionized and has no definite shape or volume. the fact of being ionized makes the substance a good electrical conductor.