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Genrish500 [490]
3 years ago
15

How many grams of co are in 125 ml of a 0.25 m solution? 0.87 g 1.1 g 14 g 880 g?

Chemistry
1 answer:
erma4kov [3.2K]3 years ago
6 0
   The number of  grams of Co that  are  in 125 Ml  of  0.25 M solution  is  0.87 grams                             

           calculation
find the number of moles
 moles= molarity  x  volume in liters
volume in liters =  125/1000 = 0.125 L
molarity =  0.25 M

moles  is therefore =  0.125 x 0.25=0.0313 moles
 mass  = moles   x molar mass

molar mass of Co= 12 +16  =28g/mol

mass   is therefore =  28 g/mol  x0.0313 moles= 0.87 grams
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When the volume of a gas is
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Answer:

THE NEW VOLUME OF THE GAS IS 406 mL WHEN THE TEMPERATURE CHANGES FROM 765 K TO 315 K.

Explanation:

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Using Charles' equation of gas laws;

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7 0
3 years ago
Jim brings his finger near a metal doorknob and receives a shock what does this demonstrates
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Explanation:

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E = k \frac{q}{r^{2} }

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Given diameter d =41.0cm, radius r = 20.5cm = 0.205m (convert cm to m)

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we are asked to determine how many excess electrons must be added to the surface of the sphere to produce this electric field

E = k \frac{q}{r^{2} }

q = <u>E x r²</u>

        k

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To determine the number of electrons, we can divide the charge q by the charge on an electron e (1.6 x 10⁻¹⁹C)

n = \frac{q}{e}

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Therefore, to apply an electric field of magnitude 1250 N/C, the isolated spherical conductor must contain 3.65 x 10¹⁰ electrons

3 0
3 years ago
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