The enthalpy of a system is the same as its:A. specific heat.
B. heat of reaction.
C. heat of combustion.
D. heat content.
Answers
The answer for above statement:
D. heat content.
Explanation:
Enthalpy is a measure of the total energy of a thermodynamic system. It includes the internal energy, which is the energy required to create a system, and the amount of energy required to make room for it by displacing its environment and establishing its volume and pressure.
Heat content - (thermodynamics) a physical science amount adequate the interior energy of a system and the merchandise of its volume and pressure.
Ans D) heat content
Enthalpy (H) is a thermodynamic state function which according to the first law of thermodynamics is a sum of internal energy (E) and the pressure- volume (PV) work.
i.e. H = E + PV
Thus, enthalpy is the total heat content of a system which includes contributions from both kinetic and potential energy.
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Answers
Answer:
31.43 ml of sulfuric acid is needed to react with 23.1 g of barium peroxide.
Explanation:
For the reaction:
BaO₂(s) + H₂SO₄(aq) ⇒ BaSO₄(s) + H₂O₂(aq)
We need 1 mole of BaO₂ to react with 1 mole of H₂SO₄ and then forming 1 mole of BaSO₄ and 1 mole of H₂O₂.
We know that 4.5 M solution of H₂SO₄ means 4.5 moles of H₂SO₄ in 1000 ml of solution.
Then,
23.1 g BaO₂ × ×
×
= 31.43 ml H₂SO₄
169g : 98g
23.1g : mx
mx = [23.1*98g]/169g ≈ 13.4g
Mr = 98g/mol
n = 13.4g/98g/mol ≈ 0.14mol
Cm = 4.5M
n = 0.14mol
V = 0.14mol/4.5mol/dm³ ≈ 0.031L = 31mL
Answers
Answer:
6 is B, 7 is A
Explanation:
Answers
Answers
2) 0.101 kg Ti into atoms
Answers
Answer:
The answer to your question is below
Explanation:
1) 0.143g of Mg into atoms
- Look for the atomic number of Magnesium in the Periodic table
Atomic number = 24.31 g
-Use the Avogadro's number to find the number of atoms
24.31g ------------------- 6.023 x 10²³ atoms
0.143 g ----------------- x
x = (0.143 x 6.023 x 10²³) / 24.31
x = 8.613 x 10²² / 24.31
x = 3.54 x 10²¹ atoms
2) 0.101 kg of Ti into atoms
-Look for the atomic number of Titanium in the Periodic table
Atomic number = 47.87 g
-Use the Avogadro's number to find the number of atoms
47.87 g --------------------- 6.023 x 10²³
101 g ---------------------- x
x = (101 x 6.023 x 10²³) / 47.87
x = 6.08x 10²⁵ / 47.87
x = 1.27 x 10²⁴ atoms
(2) 2 electrons in the first shell
(3) 3 electron shells
(4) 22 neutrons