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OverLord2011 [107]
2 years ago
9

A chemistry student needs 90.0mL of carbon tetrachloride for an experiment. By consulting the CRC Handbook of Chemistry and Phys

ics, the student discovers that the density of carbon tetrachloride is 1.59g*cm3- Calculate the mass of carbon tetrachloride the student should weigh out. Be sure your answer has the correct number of significant digits.
Chemistry
1 answer:
olasank [31]2 years ago
3 0

Answer:

volume = mass/density

 

Here, volume = 80g/1.59gcm-3 → 50.314 cm3

Explanation:

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3 years ago
How many moles of Ca are in 7.2x10^25 molecules of Ca<br> (show work)
Gre4nikov [31]

Answer:

<h2>119.60 moles</h2>

Explanation:

To find the number of moles in a substance given it's number of entities we use the formula

n =  \frac{N}{L} \\

where n is the number of moles

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L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question we have

n =  \frac{7.2 \times  {10}^{25} }{6.02 \times  {10}^{23} }   \\  =119.60132...

We have the final answer as

<h3>119.60 moles</h3>

Hope this helps you

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3 years ago
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