What is the percentage by mass of the solution formed when 22.0 grams of hcl is dissolved in 90.0 grams of water?

24.4%
22.48%
19.6%
16.7%

Mass percentage (w/w%) can be calculated using the following equation

mass percentage = mass of solute / mass of solution x 100 %

solute is HCl and solvent is water.

mass of solute is 22.0 g of HCl added

mass of solution is the mass of solvent + mass of solute

90.0 g of water and 22.0 g of HCl altogether make up - 90.0 + 22.0 = 112.0 g of solution

therefore mass percentage of solution = 22.0 g / 112.0 g x 100 % = 19.6 %

answer is 19.6%

19.6%

Explanation:

answer

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alkaline metals are lithium, sodium, rubidium, potassium, cesium and francium.

alkali metals have electronegativity from 0.7 to 1, lowest in periodic table of elements, which means that alkali metals (i group in periodic table) has positive oxidation number in compounds.

electronegativity is a chemical property that describes the tendency of an atom to attract a shared pair of electrons towards itself.

alkaline metals (far left in main group) have lowest ionizations energy and easy remove valence electrons,

for example, potassium is the alkali metal and has a single valence electron in the outer electron shell.

electron configuration of potassium is: ₁₉k 1s²2s²2p⁶3s²3p⁶4s¹.

they can not exist alone in nature, because they are very reactive.