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Valentin [98]
3 years ago
12

Calculate the volume of compound Y needed to make a 350 pg/ml treatment solution in 2 ml of 1x PBS using a stock solution contai

ning 50 ml of compound Y at 50 pg/ml. 14 l Not possible to make as described 140 pl 1.4 mi
Chemistry
1 answer:
harina [27]3 years ago
4 0

Answer:

14 mL

Explanation:

To prepare a solution by a concentrated solution, we must use the equation:

C1xV1 = C2xV2, where <em>C</em> is the concentration, <em>V</em> is the volume, 1 is the initial solution and 2 the final solution.

The final solution must have 2 mL and a concentration of 350 pg/mL, and the initial solution has a concentration of 50 pg/mL.

Then:

50xV1 = 350x2

50xV1 = 700

V1 = 700/50

V1 = 14 mL

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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 is0.74 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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However, if the force is being applied to move the box in the direction of the force, then the work done is:

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Answer:

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