3 years ago

If you are 2 meters tall, how many millimeters tall are you?

Chemistry

1 answer:

nirvana33 [79]3 years ago

3 0

Answer:

2000 millimeters

Explanation:

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irina1246 [14]

Answer:

a)The total number of platinum atoms are $6.620\times 10^{22} atoms$ .

b)The radius of a Pt atom is 138.7 pm.

Explanation:

a) Let the total number of platinum atoms be x

And mass of x atoms of platinum be m

Edge length of platinum cube ,s= 1.0 cm

Volume of the cube = $1.0 cm^3$

Density of the platinum cube = $d=21.45 g/cm^3$

Mass = Density × Volume

$(m)=21.45 g/cm^3\times 1.0 cm^3=21.45 g$

Mass of an atom of platinum = $3.240\times 10^{-22} g$

$x\times 3.240\times 10^{-22} g=21.45 g$

$x=6.620\times 10^{22} atoms$

b) If only 74 percent of the space inside the cube is taken up by Pt atoms.

Volume occupied by platinum atoms = 74% of $1.0 cm^3$

$V'= 0.74 cm^3$

Volume occupied by $6.620\times 10^{22}$ atoms is $0.74 cm^3$ .

$6.620\times 10^{22} \times \frac{4}{3}\pi r^3=V'$

$6.620\times 10^{22} \times \frac{4}{3}\times 3.14\times r^3=0.74 cm^3$

$r = 1.387\times 10^{-8} m = 138.7 pm$

The radius of a Pt atom is 138.7 pm.

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