1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
drek231 [11]
3 years ago
11

A mixture of 1.374 g of H_2 and 70.31 g of Br_2 is heated in a 2.00 L vessel at 700 K. These substances react as follows: H_2(g)

+ Br_2(g) 2 HBr(g) At equilibrium the vessel is found to contain 0.566 g of H_2. Calculate the equilibrium concentration of HBr. Express your answer using three significant figures. Use the following values in your calculations: molar mass of H_2 = 2.0159 g/mol and molar mass of Br_2 = 159.81 g/mol. Do not round any of your values in your calculations to the requested number of significant figures until the very last step.
Chemistry
1 answer:
Ne4ueva [31]3 years ago
8 0

Answer:

0.400 M

Explanation:

The reaction given is

H₂(g) + Br₂(g) ⇄ 2HBr(g)

So, the stoichiometry is 1 mol of H₂ for 1 mol of Br₂ to form 2 moles of HBr.

By the molas masses given, the number of moles of each compound is (mass/molar mass):

nH₂ = 1.374/2.0159 = 0.681581427 mol

nBr₂ = 70.31/159.81 = 0.439959952 mol

The number of moles of H₂ in the equilibrium will be:

nH₂e = 0.566/2.0159 = 0.280767895 mol

So the number of moles that reacts is the initial less the equilibrium:

n = 0.400813531 mol

For the stoichiometry, the number of moles that is formed of HBr must be double, which will be the number of moles in equilibrium:

nHBr = 0.801627063

The molar concentration is the number of moles divided by the volume:

0.801627063/2.00

0.400 M

You might be interested in
Picking up a hot coal is an example of what type of heat transfer?
Pavlova-9 [17]
Conduction should be the correct answer.
5 0
3 years ago
Read 2 more answers
Why was it so important that the scientist investigating the atom be young and unattached to existing scientific thinking
tatiyna

Answer:

so they can find the aswer and not get hurt

Explanation:

7 0
2 years ago
) Calculating Heat from Thermochemical Equations
SIZIF [17.4K]

A combustion reaction is a reaction that reacts in the presence of oxygen molecules. Methane will release -3115 kJ/mol of heat.

<h3>What is a combustion reaction?</h3>

A combustion reaction includes the reaction between the chemical reactant and oxygen molecule to produce the product. The combustion reaction between methane and oxygen is given as:

CH₄(g) + 2O₂ (g) → CO₂(g) + 2H₂O (l), ΔH = -890 kJ/mol

The stoichiometry coefficient from the reaction gives 1 mole of methane releases -890 kJ/mol enthalpy.

So, 3.5 moles methane will release = 3.5 × -890 = -3115 kJ/mol

Therefore, -3115 kJ/mol of heat is released.

Learn more about combustion reaction here:

brainly.com/question/27823881

#SPJ1

4 0
2 years ago
Salt is often added to water to raise the boiling point to heat food more quickly. if you add 30.0g of salt to 3.75kg of water,
sammy [17]

Assuming an ebullioscopic constant of 0.512 °C/m for the water, If you add 30.0g of salt to 3.75kg of water, the boiling-point elevation will be 0.140 °C and the boiling-point of the solution will be 100.14 °C.

<h3>What is the boiling-point elevation?</h3>

Boiling-point elevation describes the phenomenon that the boiling point of a liquid will be higher when another compound is added, meaning that a solution has a higher boiling point than a pure solvent.

  • Step 1: Calculate the molality of the solution.

We will use the definition of molality.

b = mass solute / molar mass solute × kg solvent

b = 30.0 g / (58.44 g/mol) × 3.75 kg = 0.137 m

  • Step 2: Calculate the boiling-point elevation.

We will use the following expression.

ΔT = Kb × m × i

ΔT = 0.512 °C/m × 0.137 m × 2 = 0.140 °C

where

  • ΔT is the boiling-point elevation
  • Kb is the ebullioscopic constant.
  • b is the molality.
  • i is the Van't Hoff factor (i = 2 for NaCl).

The normal boiling-point for water is 100 °C. The boiling-point of the solution will be:

100 °C + 0.140 °C = 100.14 °C

Assuming an ebullioscopic constant of 0.512 °C/m for the water, If you add 30.0g of salt to 3.75kg of water, the boiling-point elevation will be 0.140 °C and the boiling-point of the solution will be 100.14 °C.

Learn more about boiling-point elevation here: brainly.com/question/4206205

7 0
2 years ago
Wetlands provide habitats for many living things because of their sheltered waters and
777dan777 [17]
The choices can be found elsewhere and as follows:

<span>a. large supply of nutrients.
b. thick layer of mud.
c. lack of insects
d. ability to prevent floods.
</span>
I believe the correct answer is option A. Wetlands provide habitats for many living things because of their sheltered waters and large supply of nutrients. Hope this answers the question.
7 0
3 years ago
Read 2 more answers
Other questions:
  • Suppose a mountain range is made up of 18 mountains, each mountain has
    6·1 answer
  • Find the volume of a rock made out sandstone with a density of 2.4 g/cm^3 and a mass of 8.5g.
    9·1 answer
  • Formula los siguientes compuesto: Dietil eter, Etanol, Propanotriol, Acido Propanodioico, Pentanal, Pentano-2,4-diona, Metanoato
    10·1 answer
  • Find the volume of 56.0 grams of O2 at stp
    8·1 answer
  • Compounds
    7·2 answers
  • PLS HELP FAST WILL GIVE BRAINLEST
    11·1 answer
  • What is the pH of 0.166 M triethylammonium chloride, (C2H5)3NHCl. The Kb of triethylamine, (C2H5)3N, is 5.2 x 10-4.?
    9·1 answer
  • The heat of vaporization of an unknown liquid is 1,340 Joules per gram. What is the minimum number of Joules needed to change 20
    9·1 answer
  • If the empirical formula of an organic compound is CH20, then the molecular mass of the compound could be
    6·1 answer
  • Give an example of a rule of the natural world that a scientist can assume is always true.
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!