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PolarNik [594]
3 years ago
8

A neutral atom of helium has 2 protons and _____ electrons. (Enter a whole number.)

Chemistry
1 answer:
Mariulka [41]3 years ago
6 0

Answer:

2 electrons

Explanation:

Since the atomic structure is at it's neutral state

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A scientist is working in a lab and accidentally combines two liquids that quickly form a solution. Which process could be used
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Distillation

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The___ step in balancing a chemical equation is to take inventory or count atoms on the reactant & the product side.
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2 years ago
A 51.24-g sample of Ba(OH)2 is dissolved in enough water to make 1.20 liters of solution. How many mL of this solution must be d
g100num [7]

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0.40 L

Explanation:

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Mass = 51.24 g

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The formula for the calculation of moles is shown below:

moles = \frac{Mass\ taken}{Molar\ mass}

Thus,

Moles= \frac{51.24\ g}{171.34\ g/mol}

Moles= 0.2991\ mol

Volume = 1.20 L

The expression for the molarity is:

Molarity=\frac{Moles\ of\ solute}{Volume\ of\ the\ solution}

Molarity=\frac{0.2991\ mol}{1.20\ L}=0.24925\ M

Thus,

Considering

Molarity_{working\ solution}\times Volume_{working\ solution}=Molarity_{stock\ solution}\times Volume_{stock\ solution}

Given  that:

Molarity_{working\ solution}=0.100\ M

Volume_{working\ solution}=1\ L

Volume_{stock\ solution}=?

Molarity_{stock\ solution}=0.24925\ M

So,  

0.100\ M\times 1\ L=0.24925\ M\times Volume_{stock\ solution}

Volume_{stock\ solution}=\frac{0.100\times 1}{0.24925}\ L=0.40\ L

<u>The volume of 0.24925M stock solution added = 0.40 L </u>

6 0
3 years ago
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