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vredina [299]
3 years ago
7

20 What is the base-conjugate acid pair when a strong acid is added to methylamine, CH3NH2?

Chemistry
1 answer:
Fed [463]3 years ago
6 0
  The base  conjugate   acid pair  when strong acid is added  to  methylamine  CH3NH2   is

base CH3NH2; conjugate  acid: CH3NH3 +

                 Explanation

When   a base CH3CH2   accept   proton  it  form  its  conjugate  acid  which known as methyl  ammonium  ion. Therefore conjugate  acid  of CH3CH2  is CH3NH3+  ion

For   example  when CH3CH2  react with  HCl

CH3CH2  +HCl 
→ CH3CH3+   +   Cl- 
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How many PO43? ions are in a mole of K3PO4?
adoni [48]

K₃PO₄ → 3K⁺ (aq) + PO₄³⁻(aq)

One mole of PO₄³⁻ ion gets dissociated from one mole of K₃PO₄

As per the definition of Avogadro's number, 1 mole = 6.022 x 10²³ ions

One mole of PO₄³⁻ ions x  (6.022 x 10²³ ions/ 1 mole of PO₄³⁻ ions )

= 6.022 x 10²³ ions

Therefore , there are 6.022 x 10²³ PO₄³⁻ ions in a mole of K₃PO₄.

7 0
3 years ago
A 3.82 g piece of limestone contains 2.62 g of CaCO3
Kobotan [32]

Considering the definition of percentage by mass, the mass percentage of CaCO₃ is 68.59%.

<h3>What is mass percentage</h3>

The percentage by mass expresses the concentration and indicates the amount of mass of solute present in 100 grams of solution.

In other words, the percentage by mass of a component of the solution is defined as the ratio of the mass of the solute to the mass of the solution, expressed as a percentage.

The percentage by mass is calculated as the mass of the solute divided by the mass of the solution, the result of which is multiplied by 100 to give a percentage. This is:

mass percentage=\frac{mass of solute}{mass of solution}x100

<h3>Mass percentage of CaCO₃</h3>

In this case, you know:

  • mass of CaCO₃: 2.62 grams
  • mass of limestone: 3.82 grams

Replacing in the definition of mass percentage:

mass percentage=\frac{2.62 grams}{3.82 grams}x100

<u><em>mass percentage= 68.59 %</em></u>

Finally, the mass percentage of CaCO₃ is 68.59%.

Learn more about percentage by mass:

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7 0
1 year ago
How do compounds differ from their component elements? A. Compounds have different numbers of neutrons than their component elem
Rudiy27
The correct answer is C. Compounds have different properties than their component elements. When compounds are formed, they undergo change resulting to changes in the properties they exhibit. It will have its new set of properties different from the elements.
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3 years ago
Need ASAP will give brainlist
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Answer:

A.

The answer is A :)

7 0
2 years ago
Which material is typically used as a thermal insulator
Citrus2011 [14]

Answer: plastic, wood, rubber

Explanation:

5 0
3 years ago
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