How do instantaneous speed and average speed differ? Instantaneous speed happens all the time, but average speed only happens once per hour.
Instantaneous speed is always faster than average speed.
Instantaneous speed is the speed of an object at a specific time, but average speed is the total distance over the total time.
Instantaneous speed is always slower than average speed.

Option 3

Explanation:

Option 3: Instantaneous speed is the speed of an object at a specific time, but average speed is the total distance over the total time. This is why they are called instantaneous and average, because instantaneous is at any one instance and average is the average speed it was moving over the total time which is calculated by the total distance/total time.

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"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"

it would be d. henry moseley

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