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VLD [36.1K]
3 years ago
13

A student practicing for a track meet ran 300 meters in 30 seconds. what was her average speed?​

Chemistry
1 answer:
ololo11 [35]3 years ago
7 0

Answer:

<h2>10 m/s</h2>

Explanation:

Her average speed can be found by using the formula

v =  \frac{d}{t}  \\

d is the distance

t is the time taken

From the question we have

v =  \frac{300}{30}  = 10 \\

We have the final answer as

<h3>10 m/s</h3>

Hope this helps you

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A 720. cm^3 vessel contains a mixture of Ar and Xe. If the mass of the gas mixture is 2.966 g at 25.0°C and the pressure is 760.
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Explanation:

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     Temperature (T) = 25^{o}C = (25 + 273) K = 298 K

Using ideal gas equation, we will calculate the number of moles as follows.

                                PV = nRT

   Total atoms present (n) = \frac{PV}{RT}

                                          = 1 \times \frac{0.720 L}{0.0821 \times 298}

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Let us assume that there are x mol of Ar and y mol of Xe.

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                = 0.0197 mol

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Mol fraction of Xe = \frac{y}{(x+y)}

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Therefore, the mole fraction of Xe is 0.67.

6 0
3 years ago
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