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Dahasolnce [82]

4 years ago

9

Is boiling water exothermic or endothermic ? What about condensing?

2 answers:

Ugo [173]4 years ago

8 0

Answer:

exothermic

Explanation:

boiling water releases heat and is therfor exothermic

condensing is the reverse reaction and is endothermic

Natali5045456 [20]4 years ago

7 0

Answer:

Boiling water is endothermic while condensing is exothermic.

Explanation:

Our experience makes it easy for us to realize that to boil water or any liquid and thereby convert into a gas, heat is required and the process is endothermic. It is less intuitive to grasp that when a gas condenses to a liquid, heat is given off and the process is exothermic.

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Muscle is the newer hope it helps

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At a wastewater treatment plant, FeCl3(s) is added to remove excess phosphate from the effluent. Assume the following reactions

RoseWind [281]

Answer : The concentration of $Fe^{3+}$ needed is, $2.37\times 10^4M$

Explanation :

First we have to calculate the mole of phosphate.

As we are given that, 1 mg P/L that means, 1 mg of phosphate present in 1 L of solution.

$\text{Moles of phosphate}=\frac{\text{Mass of phosphate}}{\text{Molar mass of phosphate}}$

Molar mass of phosphate = 94.97 g/mole

$\text{Moles of phosphate}=\frac{1mg}{94.97g/mol}=\frac{0.001g}{94.97g/mol}=1.053\times 10^{-5}mol$

Now we have to calculate the concentration of phosphate.

$\text{Concentration of phosphate}=\frac{\text{Moles of phosphate}}{\text{Volume of solution}}$

$\text{Concentration of phosphate}=\frac{1.053\times 10^{-5}mol}{1L}=1.053\times 10^{-5}mol/L$

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The second equilibrium reaction is,

$FePO_4\rightleftharpoons Fe^{3+}+PO_4^{3-}$

The solubility constant expression for this reaction is:

$K_{sp}=[Fe^{3+}][PO_4^{3-}]$

Given: $K_{sp}=\frac{1}{4}$

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8 0

4 years ago

What is the density of a piece of metal that has a mass of 75.8g and a volume of 7.09

Mice21 [21]

Answer:

10.69g/cm^3 or 0.0106kg/m^3

Explanation:

10.69 g/cm^3: I wrote this answer because your question doesn't mention whether volume is in cm^3 or m^3. If its in cm^3, then this is your answer.

0.0106kg/m^3: This might also be the answer if the volume is in m^3. If it is in m^3 then you have convert grams into kilograms.

So technically since you questions incomplete, the equation for measuring density is P= m/v

P= rho (density)

m= mass

v= volume

Hope it helps- Z

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