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3 years ago

What is the ph of a solution with a hydroxyl ion (oh-) concentration of 10-10 m?

1 answer:

7 0

PH is the potential of hydrogen, pH provides a measure of the concentration of hydrogen ion while pOH scale provides the concentration of OH- ions.
pH denotes the negative logarithm of concentration of hydrogen while pOH denotes the negative logarithm of the concentration OH- ions.
Therefore; in this case the pOH= -log (OH-)
= - log (10^-10)
= 10
If the pOH is 10 then the pH of the solution will be 4

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How many moles are 21.67 L of NH4CI?

Gnoma [55]

Answer:

0.967mole

Explanation:

Given parameters:

Volume of NH₄Cl = 21.67L

Unknown:

Number of moles = ?

Solution:

If we assume that the volume was taken at standard temperature and pressure,

Then;

Number of moles = $\frac{volume }{22.4L}$

Number of moles = $\frac{21.67}{22.4}$ = 0.967mole

8 0

3 years ago

How many atoms are there in 4.13 moles of nickel (Ni)

Rudik [331]

Answer:

2.48626 x 10^24

Explanation:

We multiple 4.13 by avogadro's number to get that.

6 0

3 years ago

You would expect a phosphorous-chlorine bond to be

zlopas [31]

Answer: option 4. polar, with the chlorine end having a partial negative charge.

Explanation:

1) A polar bond is a covalent bond in which the electrons are pulled more strongly by one of the atoms and then they are not evely distributed between the two linked atoms.

2) That happens when the two atoms have diferent electronegativities.

3) As the per periodic table trend of the electronegativity, you can predict that the electronetativity of Cl is higher than that of P.

In fact, in a table of electronegativities you can find that the electronegativity of Cl is 3.16 while the electronegativity of P is 2.19.

This is a 3.16 - 2.19 = 0.97 difference.

As explained, that difference means that Cl will pull the electrons more strongly resulting if a partial negative charge on Cl and a partial positive charge on P, i.e. a polar bond.

4 0

3 years ago

Read 2 more answers

Cortisol (molecular weight 362.47 g/mole), one of the major steroid hormones, is a key factor in the synthesis of protein. Its p

frez [133]

The molecular formula of cortisol is C₂₁H₃₀O₅

Explanation:

To find the cortisol formula we use the following algorithm:

divide each element percentage by the atomic weight of the element

for carbon 69.9 / 12 = 5.83

for hydrogen 8.34 / 1 = 8.34

for oxygen 22.2 / 16 = 1.41

now the we divide the obtained numbers by the lowest one, which is 1.41

for carbon 5.83/ 1.41 ≈ 4

for hydrogen 8.34 / 1.41 ≈ 6

for oxygen 1.41 / 1.41 = 1

the empirical formula of cortisol is C₄H₆O

the molecular formula of cortisol is (C₄H₆O)ₓ

70x = 362.47

x = 362.47 / 70

x ≈ 5.2

carbon ≈ 5.2 × 4 ≈ 21

hydrogen = 5 × 6 = 30

oxygen = 5 × 1 = 5

The molecular formula of cortisol is C₂₁H₃₀O₅

Learn more about:

determining the molecular formula of a compound

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5 0

3 years ago

an iron bar weighed 664 g. after the bar had been standing in moist air for a month, exactly one-eighth of the iron turned to ru

DaniilM [7]

The final mass of the iron bar and the rust when the weight of the bar was 664g and the bar had been standing in moist air for a month, will be 688.456g.

One-eighth of the iron bar turns to rust, which means the mass of the iron bar that has undergone rusting= 664/8= 83g

Thus, the mass of pure iron left after rusting has taken place will be= (664-83)g= 581g.

The equation of rusting is as follows

4Fe + 3O2 + 6H2O → 4Fe(OH)3

Molecular weight of iron is 55.84g, thus iron will undergo the reaction= 83/55.84= 1.486 mole

Mass of Fe2O3= 159.68g

4 moles of iron produce 4 moles of rust or iron oxide

Thus, 1.486 mole of iron will produce 1.486 mole iron oxide

Mass of iron oxide= 159.68/ 1.486

Mass of rust = 107.456g

Therefore, mass of iron bar= (581+ 107.456)g

= 688.456g

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5 0

1 year ago