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
ELEN [110]
3 years ago
9

The standard enthalpy of formation (ΔHf°) of calcium carbonate is –1207 kJ/mol. Which ONE of the equations below has ΔH° = –1207

kJ? A) Ca(s) + C(s) + 3/2 O2(g) –––––> CaCO3(s) B) 2 Ca(s) + 2 C(s) + 3 O2(g) –––––> 2 CaCO3(s) C) Ca(s) + C(s) + 3 O(g) –––––> CaCO3(s) D) CaCO3(s) ––––> Ca(s) + C(s) + 3/2 O2(g) E) CaO(s) + CO2(g) –––––> CaCO3(s)
Chemistry
1 answer:
Art [367]3 years ago
3 0

Answer:

A) Ca(s) + C(s) + 3/2 O₂(g) → CaCO₃(s)

Explanation:

Standard enthalpy of formation of a chemical is defined as the change in enthalpy durin the formation of 1 mole of the substance from its constituent elements in their standard states.

The consituent elements of calcium carbonate, CaCO₃, in their standard states (States you will find this pure elements in nature), are:

Ca(s), C(s) and O₂(g)

That means, the equation that represents standard enthalpy of CaCO₃ is:

<h3>A) Ca(s) + C(s) + 3/2 O₂(g) → CaCO₃(s)</h3><h3 />

<em>Is the equation that has ΔH° = -1207kJ/mol</em>

You might be interested in
Calculate the specific heat capacity for a 15.3-g sample of gold that absorbs 87.2 J when its temperature increases from 35.0 °C
diamong [38]

Answer:

The specific heat of gold is 0.129 J/g°C

Explanation:

Step 1: Data given

Mass of gold  = 15.3 grams

Heat absorbed = 87.2 J

Initial temperature = 35.0 °C

Final temperature = 79.2 °C

Step 2:

Q = m*c*ΔT

⇒ Q =the heat absorbed = 87.2 J

⇒ m = the mass of gold = 15.3 grams

⇒ c = the specific heat of gold = TO BE DETERMINED

⇒ ΔT = The change in temperature = T2 - T1 = 79.2 - 35.0 = 44.2 °C

87.2 J = 15.3g * c * 44.2°C

c = 87.2 / (15.3 * 44.2)

c = 0.129 J/g°C

The specific heat of gold is 0.129 J/g°C

4 0
3 years ago
How many liters of hydrogen (at 0.97atm and 24c) will produce 180 grams of water
slava [35]

H₂ + ½O₂ → H₂O

2g → 18g

So, 18g water needs 2g H₂

So, 1g water needs 2/18g H₂

So, 180g water needs 2/18 x 180g H₂

→ 20 litres of H₂

6 0
3 years ago
Read 2 more answers
A puddle of water on the sidewalk evaporates and becomes water vapor. the water vapor travels through the air and comes into con
Shtirlitz [24]
2. it becomes a liquid
4. its molecules lose energy

The change in state is due to the loss of energy.

3 0
3 years ago
Read 2 more answers
75.0 grams of MgCl, is dissolved in 500.0 g of water, density 1.00 g/ml. What is the MOLALITY of this solution?
ollegr [7]

Answer:

C

Explanation:

Check it. So u can know it

8 0
2 years ago
Describe the relationship of pressure and temperature in the center of the Earth.
frutty [35]
The answer should be c because the relationship of pressure and plus the temperature decrease in the center.
4 0
2 years ago
Read 2 more answers
Other questions:
  • Samual adds a teaspoon of salt to a glass of water he notice that the salt disappears Samuel takes a sip to discover that the wa
    12·1 answer
  • What do nucleus act as
    7·2 answers
  • A 20.0-milliliter sample of HCl(aq) is completely neutralized by 32.0 milliliters of 0.50 M KOH(aq).
    6·2 answers
  • The main reason why water is often referred to as a 'universal solvent' is because:
    6·2 answers
  • Formula for the chemical reaction of limescale
    12·1 answer
  • What is process of bringing water to boiling affects
    6·1 answer
  • Should have only one variable <br> what is the word to that definition
    14·1 answer
  • Distinguish between metals, ionic compounds, and covalent compounds using information about the physical properties of a compoun
    5·1 answer
  • PLEASE HELP! How does one determine how much of a molecule is produced in a reaction?
    7·1 answer
  • A sample of methane occupies a volume of 370.0 ml at 25 oC and exerts a pressure of 1020 mm Hg. If the volume is allowed to expa
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!