Chemistry, 31.01.2020 18:52 bbthomas

When balanced, which equations would have the coefficient 3 in front of the first set of atoms? check all that apply. a. agbr + gapo4 → ag3po4 +gabr3 b. h2so4 + b(oh)3 → b2(so4)3 + h2o c. fe + agno3 → fe(no3)2 + ag d. c2h4o2 +o2 → co2 +h2o

Answers: 3

Show answers

Answers

The correct answer is A. AgBr + GaPO₄ --> Ag₃PO₄ + GaBr₃.

You can see right away that there are 3 silver atoms on the right side, and for that we will need 3 silver atoms on the left side. That would require adding a coefficient of 3 in front of the first set of atoms. And you can see that by adding this coefficient of 3 in front of AgBr, this will make 3 atoms of Br on the left side. There is already 3 atoms of bromine on the right side. This makes the equation balanced.

To balance the equation in answer choice B, you get
H₂SO₄ + B(OH)₃ --> B₂(SO₄)₃ + H₂O
H₂SO₄ + 2B(OH)₃ --> B₂(SO₄)₃ + H₂O
B is now balanced
3H₂SO₄ + 2B(OH)₃ --> B₂(SO₄)₃ + H₂O
SO₄ is now balanced
3H₂SO₄ + 2B(OH)₃ --> B₂(SO₄)₃ + 6H₂O
Oxygen and hydrogen are now balanced.
B is also a correct answer.

To balance the equation in answer choice C, you get
Fe + AgNO₃ --> Fe(NO₃)₂ + Ag
Fe + 2AgNO₃ --> Fe(NO₃)₂ + Ag
NO₃ is now balanced
Fe + 2AgNO₃ --> Fe(NO₃)₂ + 2Ag
Ag is now balanced

C is not a correct answer as the first set of atom doesn't have a coefficient of 3.

To balance the equation in D
C₂H₄O₂ + O₂ --> CO₂ + H₂O
You can see that the O₂ on the left will take care of the O₂ (in CO₂) on the right. This means that the O₂ in C₂H₄O₂ will take care of the O in H₂O.
C₂H₄O₂ + O₂ --> 2CO₂ + H₂O
Carbons are now balanced.
C₂H₄O₂ + 2O₂ --> 2CO₂ + 2H₂O
Hydrogen and oxygen atoms are balanced.

The correct answer is A and B.

Answer from: Quest

step-by-step explanation:

whole numbers, zero or greater

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, 21.06.2019 21:30

Fugu, also known as puffer fish, is a sushi delicacy that can also be lethal. puffer fish contain a powerful toxin that can kill an adult a few hours after ingestion. sushi chefs who prepare fugu must be specially trained because any contamination of the toxin-free areas of the fish can be deadly. recently this toxin has been put to good use, as scientists have discovered that a purified form of it can treat severe pain in cancer patients. this recent scientific discovery would fall under which area of chemistry? applied biochemistry pure organic chemistry pure physical chemistry applied inorganic chemistry

Answers: 1

Answer

Chemistry, 22.06.2019 09:00

Which two scientific disciplines are bridged by pharmaceutical drugs? chemistry and forensics chemistry and medicine biology and forensics biology and criminology

Answers: 3

Answer

Chemistry, 23.06.2019 00:00

#7 how does the structure of amino acids allow them to form a polypeptide? each amino acid has an amino group and a carboxyl group. each amino acid has a hydrogen atom and a carboxyl group. each amino acid has a carboxyl group and an r group. each amino acid has an r group and a hydrogen atom.

Answers: 1

Answer

Chemistry, 23.06.2019 03:00

Gravitational potential energy is related to

Answers: 1

Answer

You know the right answer?

When balanced, which equations would have the coefficient 3 in front of the first set of atoms? che...

Questions