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Alex73
2 months ago
11

25 g of ethyl alcohol is dissolved in 100 ml of water (density = 0.99993 at 20 oc). what is the % w/w for the ethyl alcohol in t

he resulting solution?
Chemistry
1 answer:
lions [2.9K]2 months ago
5 0
<span>The mass percentage represents the weight of a substance within a mixture in relation to a total mass of 100 units. It's also referred to as %w/w. To find this, you divide the mass of the solute by the total mass of the mixture. Given that we know the volume of water, we need to convert that volume into mass using its density. The calculation is as follows:

Mass of the solution = 100 mL (0.99993 g/mL) water + 25 g EtOH
Mass of the solution = 124.993 g of solution

%w/w = (25 g / 124.993 g) x 100
%w/w = 20% for EtOH</span>
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In KCI how are the valence electrons distributed
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Answer:

Explanation:

In KCl, the two elements that combine to create KCl are potassium (K) and chlorine (Cl).

Potassium, as a Group 1 element, possesses one valence electron in its outermost shell which it readily donates during bonding. Every element aims to achieve a stable electron configuration, typically with 2 or 8 electrons in its outer shell. Potassium is characterized by its lower electronegativity and higher ionization energy, making it more likely to donate its electron than to accept one. On the other hand, chlorine belongs to Group 17 and has 7 electrons in its outer shell, requiring just one additional electron to complete its octet. Chlorine’s higher electronegativity and lower ionization energy facilitate its tendency to accept an electron rather than donate it.

The bond between potassium and chlorine that results in KCl is termed an electrovalent bond.

Reaction equation:

K + Cl → KCl

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One mole of h2s gas escapes from a container by effusion in 77 seconds how long would it take one mole of nh3 gas to escape from
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Substituting values,
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3 0
2 months ago
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In an acid-base neutralization reaction 43.74 ml of 0.500 m potassium hydroxide reacts with 50.00 ml of sulfuric acid solution.
lorasvet [2795]
The neutralization reaction that occurs between potassium hydroxide and sulfuric acid can be represented as follows
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The quantity of moles of KOH is calculated using (43.74 x 0.500)/ 1000 = 0.02187 moles

Given that the stoichiometric ratio of KOH to H2SO4 is 2:1, the moles of H2SO4 can be determined as 0.02187/2 = 0.01094 moles

To find the concentration (molarity), use the formula (0.01094/50) x 1000 = 0.2188M
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2 months ago
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