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faust18 [17]
3 years ago
12

How would u figure the number of neutrons in an atom?

Chemistry
2 answers:
Korolek [52]3 years ago
8 0
Do mass number take away atomic number
disa [49]3 years ago
7 0
Subtract protons number from the mass number
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If 45 mL of water are added to 250 mL of a 0.75 M K2SO4 solution, what will the molarity of the diluted solution be?
krok68 [10]

Answer:

\large\boxed{\large\boxed{0.64M}}

Explanation:

When you form a <em>diluted solution</em> from a mother (concentrated) solution, the moles of solute are determined by the mother solution.

The main equation is:

Molarity=\dfrac{\text{moles of solute}}{\text{volume of the solution in liters}}

Then, since the moles of solute is the same for both the mother solution and the diluted solution:

          \text{Molarity mother solution }\times\text{ volume mother solution}=\\\\=\text{Molarity diluted solution }\times\text{ volume diluted solution}

Substitute and solve for the molarity of the diluted solution:

           250mL\times 0.75M=(45mL+250mL)\times M\\\\\\M=\dfrac{250mL\times 0.75M}{295mL}=0.64M

8 0
3 years ago
Which group of the periodic table contains two elements that are gases at stp?
Svetradugi [14.3K]
The group is might be labeled as VIIB or VIIA.
3 0
2 years ago
What change in energy occurs when you burn coal or petroleum??
expeople1 [14]
Chemical energy is converted to thermal energy.

4 0
2 years ago
Read 2 more answers
Draw the Lewis structure for the Se and 2 H atoms.
fomenos
When  drawing lewis dot  diagram  structure  we  consider the  number  of  valence electrons  of  the atom.Se  has  six valence electrons since  it  is  in  group  six thus  it Lewis  dot diagram  is  as  follows
       ..
     : Se:
Hydrogen  is  in  group  one  hence  has  one  valence  electron.The  lewis dot  diagram  for  2H is  therefore
        H:H
3 0
3 years ago
Read 2 more answers
Glycerol has a density of 1.20 g/ml. how many ml are in 75 g of glycerol
Vinil7 [7]
<span>75g / 1.20 = 62.5 ml.

Hope this helps :))

</span>
3 0
3 years ago
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