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3 years ago

A first place finisher in a cross country meet ran 5,000 meters in 871.7 seconds. What was his average speed?

Chemistry

1 answer:

Serjik [45]3 years ago

6 0

Answer : His average speed was, 5.735 m/s

Solution : Given,

Total distance covered = 5000 meter

Total time taken = 871.7 seconds

Average speed : It is defined as the total distance covered in total amount of time.

Formula used :

$\text{Average speed}=\frac{\text{Total distance covered}}{\text{Total time taken}}$

Now put all the given values in this formula, we get his average speed.

$\text{Average speed}=\frac{5000m}{871.7s}=5.735m/s$

Therefore, his average speed was, 5.735 m/s

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3 years ago

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3 years ago

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Answer:

See Explanation

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The question is incomplete; as the mixtures are not given.

However, I'll give a general explanation on how to go about it and I'll also give an example.

The percentage of a component in a mixture is calculated as:

$\%C_E = \frac{E}{T} * 100\%$

Where

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T = Amount of all elements/components

Take for instance:

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$T = 1 * Ca + 2 * H + 2 * O$

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So, the percentage component of calcium is:

$\%C_E = \frac{E}{T} * 100\%$

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$\%C_E = \frac{4000}{74}\%$

$\%C_E = 54.05\%$

The amount of hydrogen is:

$E = 2 * H$

$E = 2 * 1$

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So, the percentage component of hydrogen is:

$\%C_E = \frac{E}{T} * 100\%$

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$\%C_E = \frac{200}{74}\%$

$\%C_E = 2.70\%$

Similarly, for oxygen:

The amount of oxygen is:

$E = 2 * O$

$E = 2 * 16$

$E = 32$

So, the percentage component of oxygen is:

$\%C_E = \frac{E}{T} * 100\%$

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3 years ago

Use the balanced equation to solve the problem.

harkovskaia [24]

Answer:

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Explanation:

To convert between moles of N₂ and NF₃, you need to use the mole-to-mole ratio from the balanced equation. This ratio consists of the coefficients of both molecules from the balanced equation. The molecule you are converting from (N₂) should be in the denominator of the ratio because this allows for the cancellation of units. The final answer should have 3 sig figs because the given value (2.10 moles) has 3 sig figs.

1 N₂ + 3 F₂ ---> 2 NF₃

2.10 moles N₂ 2 moles NF₃
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2 years ago

A first place finisher in a cross country meet ran 5,000 meters in 871.7 seconds. What was his average speed?​

A first place finisher in a cross country meet ran 5,000 meters in 871.7 seconds. What was his average speed?