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grin007 [14]
2 years ago
8

What is the % yield when 12g of Mg react with HCl to produce 0.2g of H2?

Chemistry
1 answer:
goblinko [34]2 years ago
5 0

Answer:

The yield is 20 %.

Explanation:

Mg + 2 HCl → MgCl2 + H2

(12 g Mg) / (24.30506 g Mg/mol) x (1 mol H2 / 1 mol Mg) x (2.015894 g H2/mol) = 0.9953 g H2.

(0.2 g) / (0.9953 g) = 0.20 = 20% yield

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Margarita [4]

The answer Is B;A chemical bond holds atoms together.

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3 years ago
Help on part "c": The forensic technician at a crime scene has just prepared a luminol stock solution by adding 19.0g of luminol
Contact [7]

1. The molarity of the stock solution of luminol = 1,431 M

2. 0.12 moles of luminol is present in 2.00 L of the diluted spray

3. The volume of the stock solution (Part A) would contain the number of moles present in the diluted solution (Part B): 83.86 ml

<h3>Further explanation</h3>

Stoichiometry in Chemistry studies about chemical reactions mainly emphasizing quantitative, such as the calculation of volume, mass, amount, which is related to the number of ions, molecules, elements, etc.

In stoichiometry included :

  • 1. Relative atomic mass
  • 2. Relative molecular mass

is the relative atomic mass of the molecule

  • 3. mole

1 mole is the number of particles contained in a substance with the same number of atoms in 12 gr C-12

1 mole = 6.02.10²³ particles

While the number of moles can also be obtained by dividing the mass (in grams) by the relative mass of the element or the relative mass of the molecule

\large{\boxed{\bold{mol\:=\:\frac{grams}{ relative\:mass} }}}

Luminol (C₈H₇N₃O₂) is a substance used to detect traces of blood in the scene of a crime because it reacts with iron in the blood

a. a luminol stock solution by adding 19.0g of luminol into a total volume of 75.0mL of H2O.

So the molarity is

  • 1. Luminol mole

- the relative molecular mass of Luminol

= 8. C + 7.H + 3.N + 2.16

= 8.12 + 7.1 + 3.14 + 2.16

= 177 grams / mol

so the mole:

mol = gram / relative molecular mass

mole=\frac{19}{177}

mole = 0.1073

2. Molarity (M)

M = mole / volume

M\:=\:{\frac{ 0.1703 }{75.10^{-3} L}

M = 1,431

  • b. luminol concentration in a spray bottle 6.00 × 10⁻² M. So that in 2 L of solution, the number of moles is:

mole = M x volume

mole = 6.10⁻² x 2

mole = 0.12

  • c. Molarity of the stock solution (Part A) = 1,431 M

the number of moles present in the diluted solution (Part B) = 0.12

So the volume of the stock solution (Part A) would contain the number of moles present in the diluted solution (Part B) is:

volume = mol / M

volume\:=\:\frac{0.12}{1.431}

volume = 0.08386 L = 83.86 ml

<h3>Learn more</h3>

moles of water you can produce

brainly.com/question/1405182

the number of each atom present in the compound's formula

brainly.com/question/5303004

the ratio of hydrogen atoms (H) to oxygen atoms (O) in 2 l of water

brainly.com/question/10861183

Keywords: mole, volume, molarity, Luminol, the relative molecular mass

6 0
3 years ago
Read 2 more answers
A chemist is using a solution of HNO3 that has a pH of 3. 75. What is [H ] for the solution? Round to the nearest hundredth. × 1
Alexeev081 [22]

The estimation of the acidic and the basic character of a solution is called and defined by the pH. The \rm [H^{+}] concentration of the solution will be \rm 1.77\times 10^{-4}.

<h3>What is the pH?</h3>

pH is a measurement of the free hydrogen and hydroxyl ions in the solution of the substance.

It can be calculated as:

\rm pH  = - \rm log[H^{+}]

Given,

pH = 3.75

Substituting values in the equation:

\begin{aligned}\rm 3.75 &= -\rm log[H^{+}]\\\\\rm [H^{+}] &= 10^{-3.75}\\\\&= 1.7782 \times 10^{-4}\end{aligned}

Therefore,  \rm 1.77\times 10^{-4} is the concentration of the hydrogen ions.

Learn more about pH here:

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Which of the following effect increases the solubility of Ca(OH)2?
mash [69]

Answer:

adding an acidic solution

Explanation:

Strong acids dissociate completely in water and the H⁺ ions react with the OH⁻ ions to make H₂O. If we add an acid to our solution of Ca(OH)₂, the acid protons would react with some of the OH⁻ ions and drive the equilibrium to the right. More of the solid Ca(OH)₂ should dissolve.

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What is a limiting factor for the red-eyed tree frog?
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A limiting factor could be disease
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