Chemistry, 26.10.2019 07:43 villanuevajose95

4. suppose a student performed a precipitation reaction and isolated his precipitate. given the
data in the table below, what was the mass of the reactants before the reaction? assume no
mass loss during the isolation of the precipitate.

mass of empty flask

54.275 g

mass of precipitate

1.240 g

mass of flask and contents after isolating precipitate

122.488 g

Answers: 3

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Answers

Answer from: skyler1muir

Mass of reactant = 69.453 g

Explanation:

Given data:

Mass of empty flask = 54.275 g

Mass of precipitates = 1.240 g

Mass of flask and content after isolating the precipitates = 122.488 g

Mass of reactants = ?

Solution:

Mass of reactants must be equal to the mass of precipitates and content in flask after isolating the precipitates.

Mass of reactant = mass of precipitates+content in flask after isolating the precipitates

Mass of content in flask = Mass of flask and content after isolating the precipitates - mass of flask

Mass of content in flask = 122.488 g - 54.275 g

Mass of content in flask = 68.213 g

Mass of reactant :

Mass of reactant = mass of precipitates+content in flask after isolating the precipitates

Mass of reactant = 1.240 g + 68.213 g

Mass of reactant = 69.453 g

Answer from: Quest

- calcium has greater affinity to bond with electron receptors than hydrogen does and hence, it has the ability to replace hydrogen in most of its compounds.

- lithium has 2 valence electrons in the product because it can make only 1 bond with hydrogen. beryllium has 4 valence electrons in the product because it can only make 2 bonds. it has fewer electrons than neon and can react with electron donors. each hydrogen has 2 valence electrons, the same as helium.

- the covalent bond formed between carbon and hydrogen is polar because carbon is more electronegative than hydrogen and it attracts the bonded electron pair closer to itself, thus giving hydrogen a partial positive charge.

- a hydrogen bond is a relatively weak bond that hydrogen atoms make with the electronegative atoms nitrogen, oxygen or fluorine.

so the best choice is a.) 2 calcium (ca) atoms

Answer from: Quest

the answer is 1260

you spend 7 hours in school for 1 school day with 5 school days in 1 school week with 36 school weeks in a school year.

7*5*36= 1260 it's all about multiplying

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4. suppose a student performed a precipitation reaction and isolated his precipitate. given the

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