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2 years ago

How many grams of KNO3 must be dissolved to create 7.25L a 0.200M solution?

Chemistry

1 answer:

timofeeve [1]2 years ago

7 0

Answer:

146.6 g

Explanation:

First we calculate how many KNO₃ moles are there in 7.25 L of a 0.200 M solution, using the definition of molarity:

Molarity = moles / liters

Molarity * liters = moles

0.200 M * 7.25 L = 1.45 moles

Then we convert 1.45 moles of KNO₃ into grams, using its molar mass:

1.45 mol * 101.103 g/mol = 146.6 g

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Ca(OH)₂ + H₂SO₄ → CaSO₄ + 2H₂O

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2 years ago

(6) Compare a CSTR with a PFR below. a. A flow of 0.3 m3/s enters a CSTR (volume of 200 m3) with an initial concentration of spe

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Answer:

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Given that:

The flow rate Q = 0.3 m³/s

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Recall that:

$time (t) = \dfrac{V}{Q}$

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$time (t) = \dfrac{666.66 }{3600} hrs$

$time (t) = 0.185 hrs$

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$\dfrac{dc}{dt}=kc$

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$0.942 = \Big ( \dfrac{200}{C_e}- 1 \Big)$

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$\dfrac{V_{PFR}}{Q_{PFR}} = \dfrac{1}{k} \Big [ In ( \dfrac{C_o}{C_e}) \Big ]$

$\dfrac{V_{PFR}}{Q_{PFR}} = \dfrac{1}{5.09} \Big [ In ( \dfrac{200}{102.96}) \Big ]$

$\dfrac{V_{PFR}}{Q_{PFR}} =0.196 \Big [ In ( 1.942) \Big ]$

$\dfrac{V_{PFR}}{Q_{PFR}} =0.196(0.663)$

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