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Be sure to answer the parts.
How many molecules are contained in each of the following number of moles?
Report your answer using two significant figures.
a. 1.9 mol of penicillin molecules
b. 0.71 mol of NH3 molecules
24
a./1.1
lecules
23lecules
b. 4.8
x Lol

answer by yourhope:

how do models compare to real-world objects?

d. most models represent a real-world object in a simpler way.

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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.