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3 years ago

Can someone plz help-

Chemistry

2 answers:

Xelga [282]3 years ago

8 0

Answer: 3. a bottle that was broken into many small pieces

yan [13]3 years ago

3 0

Answer:

The answer is 3 :)

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What is the length, in dekameters, of 1073.4 centimeters?

julsineya [31]

Answer:

1.0734

Explanation:

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3 years ago

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.

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

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

Now we have to calculate the concentration of $Fe^{3+}$ .

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

$\frac{1}{4}=[Fe^{3+}]\times 1.053\times 10^{-5}mol/L$

$[Fe^{3+}]=2.37\times 10^4M$

Thus, the concentration of $Fe^{3+}$ needed is, $2.37\times 10^4M$

8 0

4 years ago

Give the characteristics of a strong acid.has a polar bondhas a weaker bond to hydrogenhas equilibrium far to the rightionizes c

Dominik [7]

Answer:

All of the above

Explanation:

Give the characteristics of a strong acid.

Has a polar bond. YES. A big difference in the electronegativity between the heteroatom and the hydrogen atom is associated with the strength of an acid.

Has a weaker bond to hydrogen. YES. A weaker bond to hydrogen makes it easier for it to break.

Has equilibrium far to the right. YES. The equilibrium of a strong acid is very shifted towards the products.

Ionizes completely in aqueous solutions. YES. A strong acid exists mostly in the ionic form in aqueous solution.

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3 years ago

Why calcium is more reactive than magnesium?

miskamm [114]

Answer:

Ca is more reactive because it has a lower

ionization energy than Mg. This is because it is lower in the periodic table. The added central electrons added over the extra period provide shielding in the center of the atom

4 0

3 years ago

Read 2 more answers

For the unbalanced reaction below, calculate how many grams of oxygen form when 2.72 g of potassium chlorate completely reacts.

Marianna [84]

The real answer is kci(s)-h2o

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3 years ago