answer.
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
arsen [322]
2 years ago
11

The enthalpy of formation of water is –285.8 kJ/mol. What can be inferred from this statement?

Chemistry
2 answers:
LiRa [457]2 years ago
4 0
A negative formation enthalpy means that the reaction is exothermic, or that heat is released during the process.
(C,)
Klio2033 [76]2 years ago
3 0

The negative enthalpy of formation of water infers that heat is released during the process.

Answer: Option C

<u>Explanation:</u>

Enthalpy is the measure of internal energy of the system with pressure and volume. And Enthalpy of formations are the measure of change in enthalpy occurred during the formation of products from its elements.

The enthalpy of formation can be defined as the change in enthalpy required to form 1 mole of products from its element. Thus it can be either negative value or positive value. So if the enthalpy of formation is negative that means the heat is released during the process.

You might be interested in
Automobile batteries are filled with an aqueous solution of sulfuric acid. What is the mass of the acid (in grams) in 800. mL of
Grace [21]

Answer:

391.462 g

Explanation:

First, let's calculate the total mass of the solution by the definition of density (d)

d = m/V, where <em>m</em> is the mass in gram and <em>V</em> the volume in mL. So for the given solution

1.285 = m/800

m = 1028 g

The mass of sulfuric acid will be:

0.3808x1028 = 391.462 g

7 0
2 years ago
Two beach balls collide, deforming during a collision. They bounce off in opposite directions. What type of collision was this?
Flura [38]

Answer: Elastic

Explanation: Both Objects  had there momentum and kinetic energy conserved.

4 0
2 years ago
Read 2 more answers
How many grams of K2CO3 would you need to put on the spill to neutralize the acid according to the following equation? 2HBr(aq)+
Mkey [24]

Full Question:

A flask containing 420 Ml of 0.450 M HBr was accidentally knocked to the floor.?

How many grams of K2CO3 would you need to put on the spill to neutralize the acid according to the following equation?

2HBr(aq)+K2CO3(aq) ---> 2KBr(aq) + CO1(g) + H2O(l)

Answer:

13.1 g K2CO3 required to neutralize spill

Explanation:

2HBr(aq) + K2CO3(aq) → 2KBr(aq) + CO2(g) + H2O(l)

Number of moles = Volume * Molar Concentration

moles HBr= 0.42L x .45 M= 0.189 moles HBr

From the stoichiometry of the reaction;

1 mole of K2CO3 reacts  with 2 moles of HBr

1 mole = 2 mole

x mole = 0.189

x = 0.189 / 2 = 0.0945 moles

Mass = Number of moles * Molar mass

Mass = 0.0945 * 138.21  = 13.1 g

3 0
2 years ago
During an investigation, students dropped a tarnished penny into a solution of acetic acid and sodium chloride. Tiny bubbles for
pogonyaev
A. The penny experienced a color change, and a gas was produced.
The penny was less tarnished (color change), and tiny bubbles formed around the penny (due to a gas being produced).
6 0
2 years ago
Consider a process in which the entropy of a system increases by 125 J K−1 and the entropy of the surroundings decreases by 125
expeople1 [14]

Answer : The process is not spontaneous.

Explanation :

As, we know that:

Change in entropy = Change in entropy of system + Change in entropy of surrounding

As we are given in question, the entropy of surroundings decrease by the same amount as the entropy of the system increases.

For the given reaction to be spontaneous, the total change in entropy should be positive.

Given :

Entropy change of system = +125J/K

Entropy change of surroundings = -125J/K

Total change in entropy = Entropy change of system + Entropy change of surroundings

Total change in entropy = 125 J/K + (-125 J/K)

Total change in entropy = 0

The process is at equilibrium because the entropy change is equal to zero. So, the process is not spontaneous.

4 0
2 years ago
Other questions:
  • Here is a sketch of a 2px orbital: This sketch is about 800pm wide. The coordinate ( x , y , and z ) axes are also shown. You ca
    15·1 answer
  • 4. How does the kinetic theory of gases explain the weather changes happening in the troposphere? You can also research on the I
    14·2 answers
  • What is the oxidation state of an individual bromine atom in kbro2?
    6·1 answer
  • Movement of electrons about a central nucleus is a concept by whom?
    14·2 answers
  • An unknown compound with a molar mass of 223.94 g/mol consists of 32.18% c, 4.50% h, and 63.32% cl. find the molecular formula f
    7·1 answer
  • A chemist requires 5.00 liters of 0.420 M H2SO4 solution. How many grams of H2SO4 should the chemist dissolve in water? 129 gram
    8·1 answer
  • Write a chemical formula for each molecular model. (Blue ball represents nitrogen atom, red ball represents oxygen atom, white b
    8·1 answer
  • Write an equation that shows the formation of a strontium ion from a neutral strontium atom
    10·1 answer
  • Question 5
    5·1 answer
  • A student in a chemistry laboratory has access to two acid solutions. The first one is 20% acid and the second solution is 45% a
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!