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3 years ago

Calculate the following to the correct number of significant figures 0.0041 cm x 2.00 cm

Chemistry

1 answer:

Vinvika [58]3 years ago

8 0

Answer:

4.1 cm³

Explanation:

When multiplying, the product must have the same number of significant figures as the factor with the least number of significant figures. 0.0041 has two significant figures, 2.00 has three significant figures, and 501 has three significant figures. The answer will have 2 significant figures.

0.0041 cm × 2.00 cm × 501 cm

= 4.1082 cm³

≈ 4.1 cm³

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Write the balanced reaction using the fewest whole number coefficients to describe the reaction between gaseous hydrogen and gas

Anastasy [175]

<u>Answer:</u> The percentage yield of water is 9.5 %

<u>Explanation:</u>

We are given:

Moles of hydrogen = 14 moles

Moles of oxygen = 10 moles

The chemical equation for the formation of water from hydrogen and oxygen follows:

$2H_2+O_2\rightarrow 2H_2O$

By Stoichiometry of the reaction:

2 moles of hydrogen gas reacts with 1 mole of oxygen gas

So, 14 moles of hydrogen gas will react with = $\frac{1}{2}\times 14=7mol$ of oxygen gas

As, given amount of oxygen gas is more than the required amount. So, it is considered as an excess reagent

Thus, hydrogen gas is considered as a limiting reagent because it limits the formation of product.

By Stoichiometry of the reaction:

2 moles of hydrogen gas produces 2 moles of water

So, 14 moles of hydrogen gas will produce = $\frac{1}{2}\times 14=7mol$ of water

To calculate the percentage yield of water, we use the equation:

$\%\text{ yield}=\frac{\text{Experimental yield}}{\text{Theoretical yield}}\times 100$

Experimental yield of water = 1.33 moles

Theoretical yield of water = 14 moles

Putting values in above equation, we get:

$\%\text{ yield of water}=\frac{1.33mol}{14mol}\times 100\\\\\% \text{yield of water}=9.5\%$

Hence, the percent yield of the water is 9.5 %.

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2 years ago

One mole of carbon will have the same number of particles as one mole of hydrogen.

AVprozaik [17]

And the answer is False,it does not have the same number with particles as the one mole of hydrogen.

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Read 2 more answers

Does an astronaut have more mass on earth then space? why or why not?

katovenus [111]

Answer:

Explanation:

No, his mass remains the same no matter where he is in the universe.

But then again the moon has less gravitational pull, therefore your weight and mass will be smaller in space and on the moon than on earth

I hope this was helpful! ;)

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eduard

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