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igomit [66]
2 years ago
12

Determine the mass of 10.55 x 1029 molecules of cadmium chloride, CdCl,().

Chemistry
1 answer:
VashaNatasha [74]2 years ago
3 0

Answer:

Moles= 10.55*10^29ǜ.02*10^23

=1.75*10^6 moles

Moles= mass/molar mass

1.75*10^6=mass/ 183

Mass= 320*10^6 g

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Enter the formula for the compound cobalt(II) phosphate. Express your answer as a chemical formula.
alexira [117]

Answer:

Co_3(PO_4)_2

Explanation:

Naming of the ionic compounds:-

  • The name of the cation is written first and the the name of the anion is written after the name of the cation separated by single space.
  • The negative ion is written next and a suffix is added at the end of the negative ion. The suffix written is '-ide'.
  • In case of transition metals, the oxidation state are written in roman numerals in bracket in front of positive ions.

Hence, given ionic compound:-

Cobalt(II) phosphate

So, Cobalt will have a positive charge of +2

Phosphate is PO_4^{3-}

So, the formula is :-

Co         PO_4^{3-}

2                    3

Co_3(PO_4)_2

5 0
3 years ago
a magnet has a north and south pole labeled in the drawing student A thinks that if you cut a magnet in half each ew parts will
riadik2000 [5.3K]

Answer:

The student is Incorrect

Explanation:

Even if you break a magnet the poles still remains same. There is no

difference in the magnet Both north  and south pole will be there even if you

cut it in to small pieces when you cut it into pieces, if suppose you  break 2

magnets and put north and north together it will repel whereas if there  are  

different  poles like north and south it will attract, so even if you break one

single magnet the different poles will attract, Hence the student is incorrect.

Please mark me as brainliest

<h3><u>Thank you </u>:)</h3>

8 0
2 years ago
This is called ____________when pressure builds up until gasses can no longer escape this substance destroys everything in its p
horsena [70]
Volcanoes can destroy each and every thing
7 0
2 years ago
C Give two reasons why the formation of aluminium by electrolysis is very<br> expensive:
stiv31 [10]

Answer:

It is expensive, largely because of the amount of electricity required in the extraction process. Aluminium ore is called bauxite . The bauxite is purified to produce aluminium oxide, a white powder from which aluminium can be extracted. The extraction is done by electrolysis.

3 0
3 years ago
0.030 moles of a weak acid, HA, was dissolved in 2.0 L of water to form a solution. At equilibrium, the concentration of HA was
nikitadnepr [17]

Answer: The value of k_{a} for the weak acid is 3.07 \times 10^{-4}.

Explanation:

First, we will calculate the molarity of HA as follows.

     [HA] = \frac{\text{no. of moles}}{\text{volume}}

             = \frac{0.03 mol}{2 L}

             = 0.015

At equilibrium,

              HA + H_{2}O \rightleftharpoons H_{3}O^{+} + A^{-}

Initial:   0.015                  0          0

Change:  -x                     +x         +x

Equilibm: 0.015 - x          x           x

It is given that, at equilibrium

          [HA] = 0.015 - x = 0.013

             - x = 0.013 - 0.015

                  = 0.002

Now, expression for k_{a} of this reaction is as follows.

          k_{a} = \frac{[A^{-}][H_{3}O^{+}]}{[HA]}

                      = \frac{x^{2}}{[HA]}

                      = \frac{(0.002)^{2}}{0.013}

                      = 3.07 \times 10^{-4}

Thus, we can conclude that the value of k_{a} for the weak acid is 3.07 \times 10^{-4}.

4 0
2 years ago
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