A racehorse completes the Kentucky Derby, a distance of 1.25 miles, in
exactly 2.00 minutes. How fast is the horse in kilometers per hour?
A. 0.00647 kilometers per hour
B. 23.3 kilometers per hour
C. 0.0168 kilometers per hour
D. 60.3 kilometers per hour

D. 60.3 kilometers per hour

Explanation:

Hello,

In this case, we first compute the miles in kilometres:

Then the minutes in hours:

Finally, the velocity:

Thus, answer is D. 60.3 kilometers per hour

Best regards.

hi,

the answer is d, it has indefinite shape but definite volume.

hope this !

here we have to get the change of moles on decrease the volume of the reaction in gas phase.

the   per the given options it will decrease by (d) 11-50%

we know, on decreasing the volume of the gas phase reaction the reaction moves to the product side.

the reaction:                     so₂cl₂ (g) = so₂ (g) + cl₂ (g)         total

the moles at equilibrium:   1 - α                 α               α           = 1+α

concentrations:                   1 - α               α               α           = 1 + α

(concentration = moles/volume, as volume is 1 l)

(where α is the degree of dissociation)

now the dissociation constant in terms of concentration is :

=  

or,

or,   = (at v = 1l)

the reaction:                     so₂cl₂ (g) = so₂ (g) + cl₂ (g)         total

the moles at equilibrium:   1 - α                 α               α           = 1+α

concentrations:               (1 - α)/0.5           α/0.5         α/0.5       = (1 + α)/0.5

thus, the dissociation constant in terms of concentration is :

or,  

=  

so, the change of 1 : 1/0.5

or, 1: 2

thus it will decrease by 50%.

or, as per the given options it will decrease by 11-50%