PLEASE HELP!!!The measurement of how fast an object moves over a certain amount of time.
2 answers:
1. Speed, since we know that , where s is speed, d is distance and t is time
2. Velocity, for velocity you need to consider the direction and displacement gives the direction of travel.
3. 25 mph, because
4. 50 mph east, velocity unlike speed has direction.
5.Velocity, displacement gives the formula direction.
6. 0, the displacement is zero so velocity is zero
7. It decreases, speed is inversely proportional to time
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Answer: The correct option is (c). The total pressure doubles.
Solution:
Initially, only 4 moles of oxygen gas were present in the flask.
(
) ( according to Dalton's law of partial pressure)
....(1)
= Total pressure when only oxygen gas was present.
Final total pressure when 4 moles of helium gas were added:
partial pressure of oxygen in the mixture :
Since, the number of moles of oxygen remains the same, the partial pressure of oxygen will also remain the same in the mixture.
= Total pressure of the mixture.
from (1)
On rearranging, we get:
The new total pressure will be twice of initial total pressure.