Answer:
The diameter of the hydrogen 
Explanation:
From the given information:
Using the concept of Bohr's Model, the equation for the angular momentum can be expressed as:

Where the generic expression for angular momentum is:
L = mvr.
replacing the value of L into the previous equation, we have:

----- (1)
The electron in the hydrogen atom posses an electrostatic force which gives a centripetal force.
----- (2)
replacing the value of v in equation (1) into (2), and taking r as the subject of the formula, we have:



For ground-state n = 1






Therefore, the diameter of hydrogen d = 2r


Answer : The reaction rate at
are 
Solution : Given,
Mass of tablet = 1000 mg
Volume of water = 0.200 L
The given formula will be,

Now we have to calculate the reaction rate at different temperatures and reaction time.




Therefore, the reaction rate at
are 
So they can prove there hypothesis is correct or have an understanding.
I say Answer choice A because it is a straight line and it hasn't gone under all those reactions yet.