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
Alexxandr [17]
2 years ago
6

LAST TRY I CANT GET THIS WRONGGG PLZ

Chemistry
1 answer:
zheka24 [161]2 years ago
8 0

Left Pane

Generally speaking and at the most fundamental level, the Enthalpy of a reaction is the sum of the products (enthalpys) minus the sum of the reactants.

At a fundamental practical beginning level of chemistry, the sums products and reactants  use their heats of formation (which is usually given to you in table form) to calculate the differences.

So the answer must involve a difference making A and B wrong. Though badly worded, the answer is C. The activation energy must be overcome in order for the reaction to take place at all. But it does not represent the Energy (Enthalpy) of the reaction making D wrong.

Answer C

Middle Pane Periodic table.

Your periodic table just isn't complete enough to give you the right answer. You must give me the number of grams in a mole of Cl. I can give you the method of doing the problem, but it will be a little off because of what I use for Chlorine.  According to Wiki, chlorine has an atomic mass of  35.453 grams per mole. If you accept that, then here is the rest of the question.

<u>Step One</u>

Find the molecular mass of chlorine

Cl2 = 2 *  35.453  = 70.906

<u>Step Two</u>

Find the number of moles of Cl2

n = given mass / molar mass

given mass = 85.3

molar mass = 70.906

n = 85.3 / 70.906

n = 1.2030 moles of Cl2

<u>Step Three</u>

Find deltaH

3 moles of Cl2 produces 464 kJ / 3 moles Cl2 [That comes from the balanced equation.]

1.2030 moles of Cl2 is x kJ

3/464 = 1.2030 / x      Cross multiply

3x = 464 * 1.203

3x = 558.19                 Divide by 3

x = 558.19 / 3

x  = 186.1 kJ

You want this to go to 3 sig digs so the answer should be 186 kJ. Since the question is worded as deltaH = etc. then your answer is plus 186 kJ to 3 places.

Right Pane

All you do is read deltaH. It is always on the reactants side (left). If it is plus (as written in the question), it is endothermic.

If it is minus, it is exothermic. Memorize.

Top Left         DeltaH  is < 0                  Exothermic

Top Right       DeltaH is > 0                   Endothermic

Bottom Left    DeltaH is < 0                   Exothermic

Bottom Right DeltaH is > 0                    Enothermic.


You might be interested in
For a principal quantum number n, how many atomic orbitals are possible?
slavikrds [6]

Answer:

The total number of orbitals for a given n value is n2.

Explanation:

For a hydrogen atom with n=1, the electron is in its ground state; if the electron is in the n=2 orbital, it is in an excited state.

5 0
3 years ago
What is physical property?
ExtremeBDS [4]
A physical property is any property that is measurable, whose value describes a state of a physical system. The changes in the physical properties of a system can be used to describe its changes between momentary states. Physical properties are often referred to as observables. They are not modal properties. 
3 0
3 years ago
Under identical conditions, separate samples of O2 and an unknown gas were allowed to effuse through identical membranes simulta
scoray [572]

Answer:

70.77 g/mol is the molar mass of the unknown gas.

Explanation:

Effusion is defined as rate of change of volume with respect to time.

Rate of Effusion=\frac{Volume}{Time}

Effusion rate of oxygen gas after time t = E=\frac{4.64 mL}{t}

Molar mass of oxygen gas = M = 32 g/mol

Effusion rate of unknown gas after time t = E'=\frac{3.12 mL}{t}

Molar mass of unknown gas = M'

The rate of diffusion of gas, we use Graham's Law.

This law states that the rate of effusion or diffusion of gas is inversely proportional to the square root of the molar mass of the gas. The equation given by this law follows:

\text{Rate of effusion}\propto \frac{1}{\sqrt{\text{Molar mass of the gas}}}

\frac{E}{E'}=\sqrt{\frac{M'}{M}}

\frac{\frac{4.64 mL}{t}}{\frac{3.12 mL}{t}}=\sqrt{\frac{M'}{32 g/mol}}

M' = 70.77 g/mol

70.77 g/mol is the molar mass of the unknown gas.

8 0
3 years ago
Marissa is learning about the unique properties of waves. She has learned that whenever the wavelength of a wave increases, the
Goshia [24]

Answer:

I believe it is B

Explanation:

4 0
3 years ago
**25 POINTS**. I doubt anyone will do this but it's worth a try to ask. To do this exercise, you will need fifteen containers, f
Travka [436]

Answer:

done not that hard

Explanation:

6 0
3 years ago
Other questions:
  • How many pairs of electrons are shared in a double bond?
    6·2 answers
  • What is the mass number of an atom with 5 proton and 7 neutrons
    8·2 answers
  • Calculate the percent by mass of carbon in CO2 (carbon dioxide).
    6·2 answers
  • What is the best definition of energy?
    13·2 answers
  • What is the WATER concentration in 1 liter of a solution that contains 2 moles of ions? (NOT the ion concentration)
    13·1 answer
  • 4. How do these measurements compare? 2500 meters and 200 grams *
    15·1 answer
  • A certain element has two naturally occurring isotopes. The atomic mass of isotope 1 (35.4723 % natural abundance) is 184.9529 a
    14·1 answer
  • Looking at page 14 of the earth science tables, how does the temperature change as a balloon rises through the Troposphere Strat
    13·1 answer
  • Chemistry-mole calculations
    6·1 answer
  • Defination of dative covalent bond
    6·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!