Вычисление молярной массы
To calculate molar mass of a chemical compound enter its formula and click ‘Compute’. В химической формуле, вы можете использовать:
- Любой химический элемент. Capitalize the first letter in chemical symbol and use lower case for the remaining letters: Ca, Fe, Mg, Mn, S, O, H, C, N, Na, K, Cl, Al.
- Функциональные группы:D, Ph, Me, Et, Bu, AcAc, For, Ts, Tos, Bz, TMS, tBu, Bzl, Bn, Dmg
- круглые () и квадратные [] скобки.
- Общие составные имена.
Примеры расчета молярной массы:
NaCl,
Ca(OH)2,
K4[Fe(CN)6],
CuSO4*5H2O,
water,
nitric acid,
potassium permanganate,
ethanol,
fructose.
Molar mass calculator also displays common compound name, Hill formula, elemental composition, mass percent composition, atomic percent compositions and allows to convert from weight to number of moles and vice versa.
Вычисление молекулярной массы (молекулярная масса)
Для того, чтобы рассчитать молекулярную массу химического соединения, введите её формулу, указав его количество массы изотопа после каждого элемента в квадратных скобках.
Примеры молекулярные вычисления веса:
C[14]O[16]2,
S[34]O[16]2.
Определение молекулярной массы, молекулярный вес, молекулярная масса и молярная масса
- Молекулярная масса ( молекулярной массой ) это масса одной молекулы вещества, выражающаяся в атомных единицах массы (и). (1 и равна 1/12 массы одного атома углерода-12)
- Молярная масса ( молекулярной массой ) является масса одного моля вещества и выражается в г / моль.
Массы атомов и изотопов с NIST статью .
См. также: молекулярные массы аминокислот
Molar mass of C 2 H 5 OH = 37.02598 g/mol
Convert grams C 2 H 5 OH to moles
or
moles C 2 H 5 OH to grams
Molecular weight calculation:
12.0107 + 2 + 1.00794 + 5 + 15.9994 + 1.00794
Percent composition by element
Element: Hydrogen
Symbol: H
Atomic Mass: 1.00794
# of Atoms: 9
Mass Percent: 24.350%
Element: Carbon
Symbol: C
Atomic Mass: 12.0107
# of Atoms: 2
Mass Percent: 51.344%
Element: Oxygen
Symbol: O
Atomic Mass: 15.9994
# of Atoms: 1
Mass Percent: 62.117%
Calculate the
molecular weight of a chemical compound
More information
on molar mass and molecular weight
In chemistry, the formula weight is a quantity computed by multiplying the atomic weight (in atomic mass units) of each element in a chemical formula by the number of atoms of that element present in the formula, then adding all of these products together.
A common request on this site is to convert grams to moles. To complete this calculation, you have to know what substance you are trying to convert. The reason is that the molar mass of the substance affects the conversion. This site explains how to find molar mass.
If the formula used in calculating molar mass is the molecular formula, the formula weight computed is the molecular weight. The percentage by weight of any atom or group of atoms in a compound can be computed by dividing the total weight of the atom (or group of atoms) in the formula by the formula weight and multiplying by 100.
The atomic weights used on this site come from NIST, the National Institute of Standards and Technology. We use the most common isotopes. This is how to calculate molar mass (average molecular weight), which is based on isotropically weighted averages. This is not the same as molecular mass, which is the mass of a single molecule of well-defined isotopes. For bulk stoichiometric calculations, we are usually determining molar mass, which may also be called standard atomic weight or average atomic mass.
Formula weights are especially useful in determining the relative weights of reagents and products in a chemical reaction. These relative weights computed from the chemical equation are sometimes called equation weights.
Finding molar mass starts with units of grams per mole (g/mol). When calculating molecular weight of a chemical compound, it tells us how many grams are in one mole of that substance. The formula weight is simply the weight in atomic mass units of all the atoms in a given formula.
Using the chemical formula of the compound and the periodic table of elements, we can add up the atomic weights and calculate molecular weight of the substance.
46.0684 g/mol
The molar mass and molecular weight of C2H5·OH is 46.068.
| Element | Symbol | Atomic Mass | # of Atoms | Mass Percent |
|---|---|---|---|---|
| Carbon | C | 24.0214 g/mol | 2 | 52.1429% |
| Hydrogen | H | 6.0476 g/mol | 6 | 13.1275% |
| Oxygen | O | 15.9994 g/mol | 1 | 34.7296% |
Ethanol Element Mass PercentCarbon24.0214gCarbon24.0214gOxygen15.9994gOxygen15.9994gHydrogen6.0476gHydrogen6.0476g
C2H5*OH # of AtomsHydrogen6Hydrogen6Carbon2Carbon2Oxygen1Oxygen1
Finding Molar Mass
Read our article on how to calculate molar mass.
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Find the Molar Mass of Ethanol, C2H5·OH Step-by-Step
There are 4 easy steps to find the molar mass of C2H5*OH based on its chemical formula.
1. Count The Number of Each Atom
The first step to finding the molar mass of Ethanol is to count the number of each atom present in a single molecule using the chemical formula, C2H5*OH:
| Element | Number of Atoms |
|---|---|
| C (Carbon) | 2 |
| H (Hydrogen) | 6 |
| O (Oxygen) | 1 |
2. Find Atomic Mass of Each Element
Next, using the periodic table, find the atomic mass in g/mol of each element (the molar mass of an element is equal to its atomic mass):
| Molar Mass (g/mol) | |
|---|---|
| C (Carbon) | 12.0107 |
| H (Hydrogen) | 1.00794 |
| O (Oxygen) | 15.9994 |
3. Compute Mass of Each Element
Multiply the number of atoms by the atomic weight of each element found in steps 1 and 2 to get the mass of each element in C2H5*OH:
| Molar Mass (g/mol) | |
|---|---|
| C (Carbon) | 2 × 12.0107 = 24.0214 |
| H (Hydrogen) | 6 × 1.00794 = 6.04764 |
| O (Oxygen) | 1 × 15.9994 = 15.9994 |
4. Sum Each Element’s Mass
Finally, add together the total mass of each element to get the molar mass of C2H5*OH:
24.0214 g/mol + 6.04764 g/mol + 15.9994 g/mol = 46.06844 g/mol
напишите пожалуйста показатели того что написано ниже (морских звезд, морских ежей, голотурии.)
ФОРМА ТЕЛА: морских звезд, морских ежей, голотурии.
ОБРАЗ ЖИЗНИ: морских звезд, морских ежей, голотурии.
СПОСОБ ПЕРЕДВИЖЕНИЯ: морских звезд, морских ежей, голотурии. ПИТАНИЕ: морских звезд, морских ежей, голотурии. очень надо к завтрашнему дню :*
- Формула: C2H6O или C2H5OH
- Относительная молекулярная масса C2H6O: 46.06844
- Молярная масса C2H6O: 46.06844 г/моль (0.04607 кг/моль)
| Элемент | Всего атомов | Атомная масса, а.е.м. | Общая масса атомов, а.е.м. |
|---|---|---|---|
| C (углерод) | 2 | 12.0107 | 24.0214 |
| H (водород) | 6 | 1.00794 | 6.04764 |
| O (кислород) | 1 | 15.9994 | 15.9994 |
| 46.06844 |
Расчёт молярной и относительной молекулярной массы C2H6O
- Mr[C2H6O] = Ar[C] * 2 + Ar[H] * 6 + Ar[O] = 12.0107 * 2 + 1.00794 * 6 + 15.9994 = 46.06844
- Молярная масса (в кг/моль) = Mr[C2H6O] : 1000 = 46.06844 : 1000 = 0.04607 кг/моль
Расчёт массовых долей элементов в C2H6O
- Массовая доля углерода (C) = 24.0214 : 46.06844 * 100 = 52.143 %
- Массовая доля водорода (H) = 6.04764 : 46.06844 * 100 = 13.128 %
- Массовая доля кислорода (O) = 15.9994 : 46.06844 * 100 = 34.73 %