# Is temperature the number of molecules?

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## Is temperature the number of molecules?

The ideal gas law can be written in terms of the number of molecules of gas: PV = NkT, where P is pressure, V is volume, T is temperature, N is number of molecules, and k is the Boltzmann constant k = 1.38 × 10–23 J/K. A mole is the number of atoms in a 12-g sample of carbon-12.

## How is Avogadro’s Law calculated?

Avogadro’s Law is stated mathematically as follows: Vn=k, where V is the volume of the gas, n is the number of moles of the gas, and k is a proportionality constant.

What will happen to the molecules of an object that is hot will there be more or less kinetic energy?

In a hot object, the particles move faster and therefore have greater kinetic energy. The theory is called the kinetic-molecular theory and is the accepted theory of heat. In this way, heat always flows from hot to cold and heat will continue to flow until the two objects have the same temperature.

### How do you solve heat and temperature?

To calculate the amount of heat released in a chemical reaction, use the equation Q = mc ΔT, where Q is the heat energy transferred (in joules), m is the mass of the liquid being heated (in kilograms), c is the specific heat capacity of the liquid (joule per kilogram degrees Celsius), and ΔT is the change in …

### How do molecules move when heated?

When heat is added to a substance, the molecules and atoms vibrate faster. As atoms vibrate faster, the space between atoms increases. The motion and spacing of the particles determines the state of matter of the substance. The end result of increased molecular motion is that the object expands and takes up more space.

How are heat capacities per molecule related to mass?

Δ U ∝ Δ K total = N K ave ∝ N Δ T The dependence on the substance results in large part from the different masses of atoms and molecules. We are considering its heat capacity in terms of its mass, but as we will see in the next chapter, in some cases, heat capacities per molecule are similar for different substances.

#### How is the temperature of a chemical reaction measured?

If the chemical reaction is exothermic, heat is released and the temperature of the system increases. If the chemical reaction is endothermic, heat is absorbed and the temperature of the system decreases. = m×sp_heat×Δt where: = amount of heat, measured in joules(J).

#### How is the quantity of heat absorbed by the calorimeter determined?

-qhot = qcold + qcal The minus sign indicates that the hot water is losing heat, whereas the cold water and the calorimeter are gaining heat. From the amount of water in the calorimeter and the temperature change undergone by the water, the quantity of heat absorbed by the calorimeter, qcal, can be determined.

How are two ways to look at temperature?

There are two ways to look at temperature: (1) the small scale action of individual air molecules and (2) the large scale action of the gas as a whole. Starting with the small scale action, from the kinetic theory of gases, a gas is composed of a large number of molecules that are very small relative to the distance between molecules.