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Dima020 [189]
3 years ago
7

a spherical sample has a mass of 2.813g. it has a diameter of 8.0mm. what is the sphere made of (determined by its density as g/

cm *3)
Chemistry
1 answer:
blondinia [14]3 years ago
5 0
To determine the density, we use the following formula:

density= \frac{mass}{volume}

mass= 2.813 grams
volume= ?

we need to first calculate the volume before we can solve for the density. since the question states that the sample has a spherical shape, we can use the volume formula of spheres to find it.

Sphere_{volume}= \frac{4}{3} \pi r^{3}

radius (r)= \frac{diameter}{2}= \frac{8.0 mm}{2} = 4.0 mm

let's plug in the values

V= \frac{4}{3} \pi 4^{3} = 268 mm^3

we need to change the mm^3 to cm^3 using the following conversion

1 cm= 10 mm
268 mm^3 (\frac{1 cm}{10 mm} )^3 = 0.268 cm^3

now we can find the density. 

density= 2.813 grams/ 0.268 cm= 10.5 g/cm3

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6 0
3 years ago
A 96.0 ml volume of 0.25 m hbr is titrated with 0.50 m koh. calculate the ph after addition of 48.0 ml of koh at 25 ∘c.
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KOH is a strong base and HBr is a strong acid and completely dissociates.
The balanced equation for the reaction is;
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What would be the mass in grams of 1.204 x 1024 molecules of sulfur dioxide
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Answer:

mass of sulfur = 96 g

Explanation:

no of moles of sulfur dioxide in 1.204\times 10^{24} molecules = \frac{1.204\times 10^{24}}{avagadro number }= \frac{1.204\times 10^{24}}{6.023\times 10^{23}}

                                       = 2 moles

therefore mass of sulfur dioxide = moles×atomic number

                                                      =2×(16+32)

                                                      =96

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What will be the new volume if 125 mL of He gas at 100 degree Celsius and .979 atm is cooled to 26 degree Celsius and the pressu
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Use Boyle's Law of Pressure: P1 x V1 = P2 x V2. Givens: P1=0.9 atm V1=                4 P2= 0.9 atm Find: V2 Equation: 0.9 atm x 4 x 4 L = 0.20 atm x V2Solve: 36 atmL= 0.20 atm x V2 18 : = V2 Short answer: The new volume is 104 ml. 
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