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marshall27 [118]
3 years ago
11

A piece of styrofoam has a mass of 15.0 grams and is the shape of a cube with each edge measuring 44.5 mm. Calculate the density

of this object in grams per cubic centimeter.
A) 0.170g/cm^3
B)2.96g/cm^3
C)1.70 x 10^3 g/cm^3
D) 296 g/cm^3
E) 667 g/cm^3

//Im really bad at Chemistry and my final is just around the corner. Someone please help this desperate child in need!//
Chemistry
1 answer:
Artemon [7]3 years ago
3 0
Density is calculated as mass divided by volume. We are given the mass of 15.0 grams, so we need to find the volume. For a cube, volume is calculated as (length of side)^3, so in this case, we have the length of a side as 44.5 mm, which is equivalent to 4.45 cm.
Volume = (4.45 cm)^3 = 88.1 cm^3
Then we divide mass by the volume:
Density = (15.0 grams) / (88.1 cm^3) = 0.170 g/cm^3
So the correct answer is A.
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a sample that has a half life of 45 years take ____ for the count rate to drop from 600 cpm to 150 cpm
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Answer:

90yrs

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Half life is the time taken for half of an original radioactive material to decay by half.

For the sample;

    Half - life = 45yrs

  Original amount  = 600cpm

 

                 Start                                  Number of atoms    

                 0yrs                                                600cpm

                                   First half life

                 45yrs                                              300cpm

                                  Second half life

                 90yrs                                               150cpm

5 0
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How many milliliters of 0.25M H2SO4 can be prepared from 57 mL of a 3.0M solution of H2SO4?
DochEvi [55]

Answer:

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Explanation:

Now, we have 0.025 M H2SO4 and we do not know how much volume we have.

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So V1= (0.03 X 525)/(0.025) = 630 ml.

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Calculate the number of Cl atoms that are in 1.1 x 10^-21 moles of Cl atoms.
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<h3>What is Avogadro's number?</h3>

Avogadro's number is defined as a proportionality factor which relates number of constituent particles with the amount of substance which is present in the sample.

According to the definitions, Avogadro's number depend on determined value of mass of one atom of those elements.It bridges the gap between macroscopic and microscopic world by relating amount of substance with number of particles.

Number of atoms can be calculated using Avogadro's number as follows: mass/molar mass×Avogadro's number or number of moles×Avogadro's number.

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Thus, there are 62.53 chlorine  atoms in 1.1x 10^-21 moles of Cl atoms.

Learn more about Avogadro's number,here:

brainly.com/question/11907018

#SPJ1

6 0
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