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ELEN [110]
3 years ago
5

2.00 mL of a 12.00 M HCL solution was reacted with 0.0450 grams of magnesium.?

Chemistry
1 answer:
Allisa [31]3 years ago
8 0

Answer:

Magnesium Mg will be the limiting reagent .

Explanation:

The limiting reagent is one that is first consumed in its entirety, determining the amount of product in the reaction. When the limiting reagent ends, the chemical reaction will stop.

In other words, the limiting reagent is that reagent that is consumed first in a chemical reaction, determining the amount of products obtained. The reaction depends on the limiting reagent, because the other reagents will not react when one is consumed.

In this case, the balanced reaction is:

Mg + 2 HCl ⇒ MgCl₂ + H₂

You know tha 2.00 mL of a 12.00 M HCl solution was reacted with 0.0450 grams of magnesium.

Being Molarity (M) the number of moles of solute that are dissolved in a certain volume, calculated by the expression:

Molarity=\frac{number of moles of solute}{volume}  ( Molarity is expressed in units \frac{moles}{liter})

then the number of moles can be calculated as:

number of moles of solute=molarity* volume

So, being:

  • molarity= 12 M
  • volume= 2 mL= 0.002 L (being 1,000 mL= 1 L)

The number of moles of HCl that react is:

number of moles of HCl= 12 M*0.002 L= 0.024

On the other hand, since the molar mass of magnesium is 24.305 g / mol, then if 0.0450 grams of magnesium react, it indicates that they must react:

0.0450 grams*\frac{1 mol}{24.305 grams} = 0.00185 moles

To determine the limiting reagent, it is possible to use the reaction stoichiometry of the reaction (that is, the relationship between the amount of reagents and products in a chemical reaction), and a simple rule of three as follows: if by stoichiometry 1 mole of Mg reacts with 2 moles of HCl, how much moles of Mg will be needed if 0.024 moles of HCl react?

moles of Mg=\frac{0.024 moles of HCl*1 moles of Mg}{2 moles of HCl}

moles of Mg= 0.012

But 0.012 moles of Mg are not available, 0.00185 moles are available. Since you have less moles than you need to react with 0.024 moles of HCl, <u><em>magnesium Mg will be the limiting reagent .</em></u>

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3 years ago
A chemist has 3.55x1022 molecules of nitrogen monoxide. How
Alina [70]

Answer:

<h2>0.059 moles</h2>

Explanation:

To find the number of moles in a substance given it's number of entities we use the formula

n =  \frac{N}{L} \\

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question we have

n =  \frac{3.55 \times  {10}^{22} }{6.02 \times  {10}^{23} }  \\  = 0.05897...

We have the final answer as

<h3>0.059 moles</h3>

Hope this helps you

6 0
3 years ago
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Contact [7]
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3 0
3 years ago
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lara [203]

Answer:

Explanation:

The atom X has 1 1 protons (atomic number) and thus would have 11 electrons. This means the atom X would have 1 valence electron in it's outermost shell. While the atom Y has 17 protons (atomic number) and thus would have 17 electrons. This means the atom Y would have 7 electrons in it's outermost shell.

The type of bond this atoms (X and Y) would form is an Ionic (or electrovalent) bond. <u>This bond/combination involves the transfer of electron(s) and a molecule is not formed</u> as seen in the image below.

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avanturin [10]

Answer: option # 4, the collisions of the gas particles may result in the transfer of energy.

Explanation:

The kinetic molecular theory (KMT) explains the behavior and properties of gases in terms of the energy, the size, and the motion of the gas particles.

In terms of size, according to the KMT the gases are formed by small particles separated from each other in a vacuum. The volume of the particles is negligible and it is considered that they do not occupy any space.

Since the particles are separated they do not exert either attraction or repulsion to each other.

Regarding the motion, the particles are in constant random motion. They move in straight lines until collide with other particles or with the walls of the veseel. The collisions are elastic (the total kinetic energy is conserved). The kinetic energy may be trasferred between the particles, but the total kinetic energy does not change.

The kinetic energy and the temperature are related: the temperature is a measure of the average kinetic energy of the particles of gas. At a given temperature all the gases have the same average kinetic energy.

Now, check every choice:

1)The gas particles are arranged in a regular pattern:

False. The particles occupy all the volumen and are in random motion.

2) The force of attraction between the gas particles are strong:

False. The particles are separated and they do not exert any force on each other.

3) The gas particles are hard spheres in continuous circular motion.

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True. When particles collide they may transfer kinetic energy but the total kinetic energy is conserved.

4 0
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