Chemistry, 01.01.2020 05:31 kate9627

the following balanced equations represent double replacement reactions that each result in the formation of precipitation. for each reaction, which ratio of reactants would result in the formation of the greatest amount of precipitate? cu(no3)2(aq) -> cu(oh)2(s)+ 2nano3 (aq) note: cu(oh)2 is a blue precipitate.

feso4 (aq) + 2naoh (aq) -> fe(oh)2 (s) + na2so4 (aq) note: fe(oh)2 is a dark green precipitate.

fe(no3)3 (aq) + 3naoh (aq) -> fe(oh)3 (s) + 3nano3 (aq) note: fe(oh)3 is a red-orange precipitate

Answers: 2

Show answers

Answers

Answer from: ambercable3

1) Cu(NO₃)₂(aq) + 2NaOH (aq) -> cu(OH)₂(s)+ 2NaNO₃ (aq)

reactants ratio = Cu(NO₃)2 : NaOH = 1:2

2) FeSO₄ (aq) + 2NaOH (aq) ->Fe(OH)₂ (s) + Na₂SO₄ (aq)

reactants ratio = FeSO₄ : NaOH = 1:2

3) Fe(NO₃)₃ (aq) + 3NaOH (aq) -> Fe(OH)₃ (s) + 3NaNO₃ (aq)

reactants ratio = Fe(NO₃)₃ : NaOH = 1:3

Explanation:

For any reaction to occur completely, the ratio of the reactants should be the ratio of their coefficients is the balanced chemical equation.

A balanced equation is an equation for a chemical reaction in which the number of atoms for each element in the reaction and the total charge is the same for both the reactants and the products.

In our case, we get greatest amount of precipitate only when the reactants completely undergo chemical change and turn into products.

so, when reactants are taken in the ration of balanced equation, the reactants completely form products, where here one of the products is precipitate.

1) Cu(NO₃)₂(aq) + 2NaOH (aq) -> cu(OH)₂(s)+ 2NaNO₃ (aq)

reactants ratio = Cu(NO₃)2(aq) : NaOH (aq) = 1:2

2) FeSO₄ (aq) + 2NaOH (aq) ->Fe(OH)₂ (s) + Na₂SO₄ (aq)

reactants ratio = FeSO₄ (aq) : NaOH (aq) = 1:2

3) Fe(NO₃)₃ (aq) + 3NaOH (aq) -> Fe(OH)₃ (s) + 3NaNO₃ (aq)

reactants ratio = Fe(NO₃)₃ (aq) : NaOH (aq) = 1:3

Answer from: Quest

Ithink this is what you meant. the temperature at which a liquid begins to boil is called the boiling point. the boiling point of water is 212°f or 100°c. and at that point will start to turn into steam (gas)

Answer from: Quest

answer : third trial had the contaminated sample and the correct value for dhrxn should be 1000 kj/mol

explanation :

let us write down the given equations

equation 1 : $4x (s) + 3o_{2} (g) \rightarrow 2x_{2}o_{3} (s) h rxn = -600 kj/mol$

equation 2 : $2x (s) + 3cl_{2} (g) \rightarrow 2xcl_{3} (s) h rxn = -800 kj/mol$

equation 3 : $4xcl_{3} (s) + 3o_{2} (g) \rightarrow 2x_{2}o_{3} (s) + 6cl_(2} h rxn = -200 kj/mol$

let us use hess's law to find out which 2 equations can be added to get the third equation.

let us reverse equation 2 and multiply it by 2. the new equation that we get is,

equation 4 : $4xcl_{3} (s) \rightarrow 4x (s) + 6cl_{2} ( h rxn = (+800) \times 2 kj/mol$

let us add equation 1 & 4

$4x (s) + 3o_{2} (g) \rightarrow 2x_{2}o_{3} (s) h rxn = -600 kj/mol$

$4xcl_{3} (s) \rightarrow 4x (s) + 6cl_{2} ( h rxn = (+1600) kj/mol$

$4xcl_{3} )s) + 3o_{2} \rightarrow 2x_{2}o_{3} (s) + 6cl_{2} (g) h rxn = (+1000) kj/mol$

the above equation is similar to equation 3 but has different value for dhrxn.

therefore third trial had the contaminated sample and the correct value for dhrxn should be 1000 kj/mol

Another question on Chemistry

Chemistry, 22.06.2019 07:30

According to the vsepr theory what is the shape of a molecule that has a central atom valence three other items with no lone pairs of electrons

Answers: 1

Answer

Chemistry, 22.06.2019 12:20

Which is an example of the practical pursuit of alchemy? a. forming perfect substances. b. transforming base metals. c. developing metalworking techniques. d. linking spiritual characteristics with material substances.

Answers: 1

Answer

Chemistry, 22.06.2019 15:30

How does a large body of water, such as the ocean, influence climate?

Answers: 1

Answer

Chemistry, 22.06.2019 16:00

As changes in energy levels of electrons increase, the frequencies of atomic line spectra they emit

Answers: 2

Answer

You know the right answer?

the following balanced equations represent double replacement reactions that each result in the form...