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tensa zangetsu [6.8K]
2 years ago
7

In a closed container at 1.0 atmosphere, the temperature of a sample of gas is

Chemistry
1 answer:
dem82 [27]2 years ago
3 0

Answer:

A. 0.010 atm awnser would be

Explanation:

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How many grams of potassium chloride are required to make 250 ml of a 0.75 m kcl solution?
DedPeter [7]

Answer:

The solution would need 13.9 g of KCl

Explanation:

0.75 m, means molal concentration

0.75 moles in 1 kg of solvent.

Let's think as an aqueous solution.

250 mL = 250 g, cause water density (1g/mL)

1000 g have 0.75 moles of solute

250 g will have (0.75 . 250)/1000 = 0.1875 moles of KCl

Let's convert that moles in mass (mol . molar mass)

0.1875 m . 74.55 g/m = 13.9 g

7 0
2 years ago
Write the chemical reaction that is responsible for the ph of a buffer which contains nh3 and nh4cl. write the reaction in such
VMariaS [17]
Ammonia (NH₃) shows basic character in aqueous solution:
NH₃ + H₂O ⇄ NH₄⁺ + OH⁻. This is basic buffer, because contains hydroxide anions.
Ammonium chloride is salt and in water dissociate:
NH₄Cl → NH₄⁺ + Cl⁻.
Ammonium ion shows acidic character in aqueous solution::
NH₄⁺ + H₂O ⇄ NH₃ + H₃O⁺.
Ka = [NH₃] · [H₃O⁺] ÷ [NH₄⁺].
5 0
2 years ago
11. How did the solubility product constant Ksp of KHT in pure water compare to its solubility product constant Ksp of KHT in KC
Airida [17]

Answer:

Explanation:

KHT is a salt which ionises in water as follows

KHT ⇄ K⁺ + HT⁻

Solubility product Kw= [ K⁺ ] [ HT⁻ ]

product of concentration of K⁺ and HT⁻ in water

In KCl solution , the solubility product of KHT will be decreased .

In KCl solution , there is already presence of K⁺  ion in the solution . So

in the equation  

[ K⁺ ] [ HT⁻ ]  = constant

when K⁺ increases [ HT⁻ ] decreases . Hence less of KHT dissociates due to which its  solubility decreases . It is called common ion effect . It is so because here the presence of common ion that is K⁺ in both salt to be dissolved and in solvent , results in decrease of solubility of the salt .

7 0
2 years ago
A certain material has a density of 0.2 g/ml. Is this material good for building a bridge or for making a cushion for a couch
Dafna1 [17]
A cushion because of its low density
6 0
2 years ago
FOCUS QUESTION<br> Why do elements in the same group have similar<br> properties?
SIZIF [17.4K]

Answer:

  1. Elements of the  the same group have similar number of valence electrons.
  2. They have identical number of electrons in their outermost shell. For example ;  All the alkali metals in Group 1 have 1 valence electron.

And so many more.

Due to all these similarities ,they have similar  properties and they tend to react similarly with other substances.

Explanation:

7 0
2 years ago
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