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Arlecino [84]
3 years ago
15

What is 9,865 km expressed in scientific notation? A. 9.865 × 100 km B. 9.865 × 102 km C. 9.865 × 103 km D. 9.865 × 10-3 km

Chemistry
1 answer:
joja [24]3 years ago
6 0

Answer:

A scientific notation is when a number is between 1 and 10 times a power of 10. Your answer will probably be 9.865 x 10³ km or 9.865.

Go for C (?)

Sorry it's hard for me to read with the layout heh...

-Hope this helps

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D. Not all mixtures are heterogeneous
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Answer:

        \large\boxed{\large\boxed{5.00\times 10^{22}atoms/cm^3}}

Explanation:

You can convert the <em>density</em> into <em>atomic density</em> using the <em>atomic weight </em>and Avogadro's number

A dimensional analysis is very helpful:

           \dfrac{g}{cm^3}\times \dfrac{mol}{g}\times \dfrac{atoms}{mol}=\dfrac{atoms}{cm^3}

Follow the chain: g cancels with g, mol cancels with mol; at the end, what remains is atoms/cm³, which is what you want.

Use that with your data:

         \dfrac{2.33g}{cm^3}\times \dfrac{1mol}{28.09g}\times \dfrac{6.022\times 10^{23}atoms}{mol}=\approx 5.00\times10^{22}atoms/cm^3

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3 years ago
How many molecules of sugar are there in 1 can of soda?
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Answer:

5.8\cdot 10^{22}

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Our first step is to find the molar mass of sugar:

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Secondly, dividing mass of sugar, m = 33 g, by the molar mass will yield the number of moles of sugar:

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Finally, multiplying moles by the Avogadro's constant will yield the number of molecules:

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