Chemistry, 07.12.2019 03:31 martinezjulio1976

Which of the following steps correctly 1.25 of fluorine to an equivalent mass of fluorine in grams?

a. add 1.25 to the atomic mass of fluorine
b. divide the atomic of fluorine by 1.25
c. subtract 1.25 from the atomic mass of fluorine
d. multiply the atomic mass of fluorine by 1.25

Answers: 2

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Answer from: elizabethseoane1829

D. Multiply the atomic mass of fluorine by 1.25

Explanation:

We are given;

1.25 moles of Fluorine

We need to identify the formula that shows the equivalent in mass

We need to know the relationship between mass of an element, its atomic mass and the number of moles;That is; Number of moles = Mass of the element ÷ Atomic mass

Therefore;

Mass of the element = Number of moles × atomic mass

Thus, in this case, to get mass we will multiply number of moles by atomic mass of Fluorine.That is, multiply atomic mass of fluorine by 1.25 moles .

Answer from: Quest

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.

Answer from: Quest

the correct answer is b. a strong acid completely dissociates to its ions when dissolved in water. $hbr$ completely dissociates to $h^+$ and $br-$ ions. a is incorrect because $h_2s$ does not fully ionize to $h^+$ and $hs^-$ ions and some remain as the compound $h_2s$ . c and d are incorrect because, $li_2o$ and $libr$ do not fall into the category of bronsted lowry acids. a bronsted lowry acid is a proton donor and since both molecules do not have a proton to donate they are not bronsted lowry acids. likewise, if we use the lewis acid definition, they cannot be acids. a lewis acid is an electron pair acceptor. both $li_2o$ and $libr$ have a complete octet so can not accept any electrons which disqualifies them as acids.

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Which of the following steps correctly 1.25 of fluorine to an equivalent mass of fluorine in grams?...

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