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3 years ago

The element with the atomic mass of 12 amu, and 6 nuetrons: (E2) A (B3) (D4) O (14)

Chemistry

1 answer:

DENIUS [597]3 years ago

5 0

Answer:like my photo bc i like it

Explanation:

omg i look .........................................

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Answer:

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3 years ago

4. A 0.100 M solution of NaOH is used to titrate an HCl solution of unknown concentration. To neutralize the solution, an averag

PtichkaEL [24]

Answer:

C. 0.191 M

Explanation:

Our goal for this question, is to calculate the concentration of the HCl solution. For this, in the experiment, a solution of NaOH was used to find the moles of HCl. Therefore, our first step is to know the reaction between HCl and NaOH:

$HCl~+~NaOH~->~NaCl~+~H_2O$

The "titrant" in this case is the NaOH solution. If we know the concentration of NaOH (0.100M) and the volume of NaOH (38.2 mL=0.0382 L), we can calculate the moles using the molarity equation:

$M=\frac{mol}{L}$

$0.100~M=\frac{mol}{0.0382~L}$

$mol=0.100~M*0.0382~L=0.0382~mol~of~NaOH$

Now, in the reaction, we have a 1:1 molar ratio between HCl and NaOH (1 mol of HCl is consumed for each mole of NaOH added). Therefore we will have the same amount of moles of HCl in the solution:

$0.0382~mol~of~NaOH\frac{1~mol~HCl}{1~mol~NaOH}=0.0382~mol~HCl$

If we want to calculate the molarity of the HCl solution we have to divide by the litters of HCl used in the experiment (20 mL= 0.02 L):

$\frac{0.0382~mol~HCl}{0.02~L}~=~0.191~M$

The concentration of the HCl solution is 0.191 M

I hope it helps!

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3 years ago

We need a 3.0M aqueous HCl solution to dissolve the middle of a penny which is made of nickel. What mass of HCl is contained in

natta225 [31]

Answer:

262.8 g

Explanation:

Molarity = 3.0M

Mass = ?

Volume = 2.40L

The relationship between these quantities is given as;

Molarity = Number of moles / Volume

Number of moles = Molarity * Volume

Number of moles = 3 * 2.4 = 7.2 mol

Mass = Number of moles * Molar mass

Molar mass of HCl = 1 + 35.5 = 36.5 g/mol

Mass = 7.2 * 36.5 = 262.8 g

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3 years ago

Which best describes the function of a centrifuge?

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The correct answer is the last statement. Centrifugation is to separate the undissolved particles of a mixture into layers. It separates a homogeneous mixture by spinning it at high speeds. The precipitate settles at the bottom while the solution is clear.

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4 years ago

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