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3 years ago

How do you find the number of neutrons in an element

Chemistry

2 answers:

viva [34]3 years ago

8 0

Answer: Atomic mass - Atomic number

Explanation:

To find the number of neutrons in an element, you want to subtract the atomic mass by the atomic number. The atomic number tells us the number of protons in the element. The atomic mass is the protons plus the neutrons. Therefore, you subtract the atomic mass and atomic number to cancel out the protons, leaving us with only neutrons.

e-lub [12.9K]3 years ago

6 0

Answer:

Mass number -Atomic number

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3 years ago

Molarity to percent by mass. Convert 1.672 mol/L MgCl2(aq) solution to percent by mass of MgCl2 in the solution. The solution de

nignag [31]

Answer:

$\%m/m=14\%$

Explanation:

Hello!

In this case, since the molarity of magnesium chloride (molar mass = 95.211 g/mol) is 1.672 mol/L and we know the density of the solution, we can first compute the concentration in g/L as shown below:

$[MgCl_2]=1.672\frac{molMgCl_2}{L}*\frac{95.211gMgCl_2}{1molMgCl_2}=159.2\frac{gMgCl_2}{L}$

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$[MgCl_2]=159.2\frac{gMgCl_2}{L}*\frac{1L}{1000mL}*\frac{1mL}{1.137g}=0.14$

Which is also the by-mass fraction and in percent it turns out:

$\%m/m=0.14*100\%\\\\\%m/m=14\%$

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6 0

3 years ago

What is the number of molecules of c2h5oh in a 3m solution that contains 4.00kg h2o?

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by use of Avogadro law constant

1 mole =6.02 x10^23 molecules

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=12 moles/1 moles x 6.02 x10^23 = 7.224 x10^24 molecules

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3 years ago

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2 years ago