Guide

1

Mass with the volume between them are closely linked.When you are considering a variety of tasks ,null, you see that the volume can be found in several ways, knowing the mass.And the problem, as a rule, relate to two sciences - physics and himii.Samy easy way to find the volume - is its expression in terms of density.It is known that density is mass divided by volume: ρ = m / V.Sootvetstvenno volume equals: V = m / ρ.Massa two materials may be the same.However, if these are different substances, such as copper and iron, the amount of them will be different because their densities differ.

2

In chemistry there is a model of an ideal gas of 1 mol with a constant molar volume V = 22,4 mol / l.This gas has a volume at a constant pressure a
nd temperature.Molar volume deals mainly with the position chemistry.From the physical point of view, the amount may vary.Nevertheless, there is a relationship of molar volume and the volume of a portion of gas: vM = Vc / nin, where V m - molar volume;Vc - volume portion of gas;n in the - number veschestva.Kolichestvo substance is: nin = Mw / Mw, where Mw - weight substances, Mw - veschestva.Sootvetstvenno molar mass, the volume portion of gas is: Vc = Vm * mV / Mw.

3

If the problem given the concentration of the substance and its mass, the volume can be easily expressed in the formula: c = n / V = m / M / V.MV = m / c, where M - the molar massveschestva.Otsyuda volume calculated using the formula: V = m / Mc = n / V, where n - the number of substances.

4

If the problem is given an ideal gas with some pressure p, temperature T and the amount of substance n, then we can apply the equation Mendeleev-Clapeyron, which allows to express the amount of: pV = mRT / M, where R - universalpostoyannaya.Sootvetstvenno gas on the basis of the equation, looking for volume: V = mRT / Mp.Eto ish equation is only suitable for those gases whose parameters are close to ideal.

# Tip 2: How to find a lot of volume

body weight - this is one of its most important physical characteristics that shows its gravitational properties.Knowing the volume of the substance, as well as its density, can be easily calculated and

**body weight, based on the substance and lies.**

you need

- volume of material V, the density p.

Guide

1

Let us given to non-uniform material with a mass of V and mass m.Then, the density can be calculated by the formula:

p = m / V.

From this it follows that in order to calculate the mass

p = m / V.

From this it follows that in order to calculate the mass

**matter, you can use its corollary:**

m = p * V.Consider this example: Suppose we are given a platinum bar.Its volume is equal to 6 cubic meters.We find it a lot

problem is solved in two steps:

1) According to Table density of various substances, the density of platinum is 21500 kg / cu.meters.

2) Then, knowing the density and volume of the substance, calculate its mass

6 * 21500 = 129000 kg, or 129 tons.m = p * V.Consider this example: Suppose we are given a platinum bar.Its volume is equal to 6 cubic meters.We find it a lot

**.**problem is solved in two steps:

1) According to Table density of various substances, the density of platinum is 21500 kg / cu.meters.

2) Then, knowing the density and volume of the substance, calculate its mass

**:**6 * 21500 = 129000 kg, or 129 tons.

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Sources:

- how to find the volume of