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VMariaS [17]
3 years ago
14

a car is traveling 55.0 miles per hour . convert this to meters per second . one miles is equal to 1.61 km

Chemistry
2 answers:
Leno4ka [110]3 years ago
3 0
55 miles/1 hour(1.61 km/1 mile)(1000 meters/1km)=88550 meters per hour
88550 meters/1 hour(1 hour/60 minutes)(1 minute/60 seconds)
=24.5972 meters per second
Vilka [71]3 years ago
3 0

Answer : The speed of car in meters per second is 24.597 m/s

Explanation :

The conversion used from miles to kilometer is:

1 mile = 1.61 km

The conversion used from kilometer to meter is:

1 km = 1000 m

So, 1mile=\frac{1.61km}\times \frac{1000m}{1km}=1610m

The conversion used from hour to second is:

1 hr = 3600 s

So, 1mile/hr=\frac{1610}{3600}m/s

As we are given the speed 55.0 miles per hour. Now we have to determine the speed in meter per second.

As, 1mile/hr=\frac{1610}{3600}m/s

So, 55.0mile/hr=\frac{55.0mile/hr}{1mile/hr}\times \frac{1610}{3600}m/s=24.597m/s

Therefore, the speed of car in meters per second is 24.597 m/s

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What volume of a 0.550 M solution of potassium hydroxide (KOH) can be made with 19.9 g of potassium hydroxide?
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Answer:

0.645 L

Explanation:

To find the volume, you need to (1) convert grams to moles (using the molar mass) and then (2) calculate the volume (using the molarity ratio). The final answer should have 3 sig figs to match the sig figs of the given values.

(Step 1)

Molar Mass (KOH): 39.098 g/mol + 15.998 g/mol + 1.008 g/mol

Molar Mass (KOH): 56.104 g/mol

19.9 grams KOH              1 mole
--------------------------  x  -----------------------  =  0.355 moles KOH
                                     56.014 grams

(Step 2)

Molarity = moles / volume                            <----- Molarity ratio

0.550 M = 0.355 moles / volume                 <----- Insert values

(0.550 M) x volume = 0.355 moles              <----- Multiply both sides by volume

volume = 0.645 L                                          <----- Divide both sides by 0.550

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1 year ago
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