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3 years ago

The sum of potential and kinetic energies in the particles of a substance is called _______ energy.

Chemistry

2 answers:

Cloud [144]3 years ago

5 0

I think the sum of potential and kinetic energies in the particles of a substance is called the internal energies ?

White raven [17]3 years ago

5 0

Answer: Mechanical energy

Explanation:

Mechanical energy of a body can be defined as the sum of potential energy and kinetic energy of a system.

The conservation of mechanical energy states that the sum of kinetic energy and potential energy in a system remains constant.

The only condition is the forces acting on it should be conservative forces.

Example: Running of a dog. It is its mechanical energy that is allowing a dog to run by the combination of kinetic and potential energy.

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3 years ago

In the unbalanced chemical reaction for the combustion of propane determine at standard temperature and pressure how many liters

Semmy [17]

Answer:

9 liters of CO₂ are produced by this combustion

Explanation:

In order to determine the volume of produced CO₂, we start with the reaction:

C₃H₈(g) + 5O₂(g) → 3CO₂(g) + 4H₂O(g)

We need, O₂ density to find out the mass, that has reacted.

δ O₂ = O₂ mass / O₂ volume → δ O₂ . O₂ volume = O₂ mass

δ O₂ = 1.429 g /dm₃ (1dm³ = 1L) 1.429 g/L . 15L = 21.4 g of O₂

We convert the mass to moles: 21.4 g . 1mol / 32 g = 0.670 moles

By stoichiometry, 5 moles of O₂ can produce 3 moles of CO₂

Then, 0.670 moles of O₂ will produce (0.670 . 3) /5 = 0.402 moles of dioxide.

We apply Ideal Gases Law for STP, to find out the CO₂ volume

V = (n . R . T) / P → V = (0.402 mol . 0.082 . 273K) / 1 atm = 8.99 L ≅ 9 L

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3 years ago