3 years ago

What rule is used to estimate your total stopping distance under ideal conditions?

Chemistry

1 answer:

Nadya [2.5K]3 years ago

8 0

The 4 second rule is used to estimate your total stopping distance under ideal conditions.

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A ball has a mass of 2.0 kg and travels a distance of 24 meters in 10 seconds what is the Velocity

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2.4 meters per second

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3 years ago

What is the number of valence electrons in an atom of Al? a. 13 b. 3 c. 10 d. 8

Svet_ta [14]

There are three valence electrons in an atom of Aluminum (Al).
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Al · or : Al : ·
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The answer is B.

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3 years ago

How many milliliters is 0.55 L? O A. 1000 ml OB. 0.00055 mL O C. 550 ml D. 55 mL

kolbaska11 [484]

Answer:

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4 years ago

A 4.215 g sample of a compound containing only carbon, hydrogen, and oxygen is burned in an excess of oxygen gas, producing 9.58

Scilla [17]

Answer:

$\% O=27.6\%$

Explanation:

Hello,

In this case, for the sample of the given compound, we can compute the moles of each atom (carbon, hydrogen and oxygen) that is present in the sample as shown below:

- Moles of carbon are contained in the 9.582 grams of carbon dioxide:

$n_C=9.582gCO_2*\frac{1molCO_2}{44gCO_2}*\frac{1molC}{1molCO_2} =0.218molC$

- Moles of hydrogen are contained in the 3.922 grams of water:

$n_H=3.922gH_2O*\frac{1molH_2O}{18gH_2O} *\frac{2molH}{1molH_2O} =0.436molH$

- Mass of oxygen is computed by subtracting both the mass of carbon and hydrogen in carbon dioxide and water respectively from the initial sample:

$m_O=4.215g-0.218molC*\frac{12gC}{1molC} -0.436molH*\frac{1gH}{1molH} =1.163gO$

Finally, we compute the percent by mass of oxygen:

$\% O=\frac{1.163g}{4.215g}*100\% \\\\\% O=27.6\%$

Regards.

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4 years ago

Please help i really need it!

svp [43]

Answer:

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Explanation:

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3 years ago