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Fed [463]
3 years ago
5

A sprinter set a high school record in track and field, running 200.0 m in 21.7 s . What is the average speed of the sprinter in

kilometers per hour?
Chemistry
1 answer:
Yuliya22 [10]3 years ago
7 0

Given data:

Distance travelled (d)= 200.0 m

Time taken (t) = 21.7 s

To determine:

The average speed in km/hr

Calculation:

Convert distance from m to km

1000 m = 1 km

200.0 m = 1 km * 200.0 m/1000 m = 0.2 km

Convert time from sec to hours

3600 sec = 1 hour

21.7 sec = 1 hour * 21.7 sec/3600 sec = 6.027 *10^-3 hrs

Speed is defined as the amount of distance travelled per unit time

Speed = distance/time = 0.2 km/6.027*10^-3 hr

           = 33.18 km/hr (or 33.2 km/hr)

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3 years ago
Phosgene is formed from carbon monoxide and chlorine. At 611 oC, Kc is approximately 16.5 M-1 or L/mol. Calculate Kp (in atm-1)
defon

Answer:

Kp is 0.228/atm

Explanation:

This is the reaction:

CO + Cl<u>₂</u> → CCl₂O

1 mol of carbon monoxide and 1 mol of chlorine produce 1 mol of phosgene.

Formula for Kp which derivates from Kc is:

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Determine the number of molecules in 0.0500 mole of boron tribromide<br> (show work)
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Answer:

There are 0.5 moles

Explanation:

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To calculate the moles, we use the equation:

Thus there are 0.5 moles

Explanation:

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