Atomic Mass Of H2o

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Atomic mass of Hydrogen + Atomic mass of water = 1×2+16 = 2+16 = 18g. 18g of H2O = 1 mole. So, 0.5 mole = 18×0.5 = 9.0g. . Skill 3-1 Calculate the molecular mass of a compound as the sum of the atomic masses of its elements. Molecular mass H 2 O = (2 x atomic mass of H) + atomic mass of O = 2(1.008 amu) + 16.00 amu = 18.02 amu. So, one mole of water (6.022 x 10 23 molecules) has a mass of 18.02 g. Molar mass of NaCl = atomic mass of Na (22.99 amu) +. Definitions of molecular mass, molecular weight, molar mass and molar weight. Molecular mass (molecular weight) is the mass of one molecule of a substance and is expressed in the unified atomic mass units (u). (1 u is equal to 1/12 the mass of one atom of carbon-12) Molar mass (molar weight) is the mass of one mole of a substance and is.

Definition and molecular weight (molar mass) of some common substances

The molecular weight of a substance, also called the molar mass, M, is the mass of 1 mole of that substance, given in M gram.

In the SI system the unit of M is [kg/kmol] and in the English system the unit is [lb/lbmol], while in the cgs system the unit of M is [g/mol]. Molecular weight is represented by thesame number in all unit systems regardless of the system used. For this reason, in many cases the unit for the molecular weight is not mentioned; however, one must realize that it is not a dimensionless parameter.

Atomic

The molecular weight of a pure compound is determined from its chemical formula and the atomic weights of its elements. The atomic weights of the elements found in organic substances are C = 12.011, H = 1.008, S = 32.065, O = 15.999, and N = 14.007.
Example: The molecular weight of ethanol (C2H5OH)
To calculate the molecular weight of ethanol, the molecular weight of each atom in the molecule is summed:

Methanol = 2*12.011[kg/kmol] + 6*1.008[kg/kmol] + 1*15.999 [kg/kmol] = 46.069 [kg/kmol]

See also Physical data for hydrocarbons, Physical data for alcohols and carboxylic acids, Physical data for organic nitrogen compounds and Physical data for organic sulfur compounds

Substance

Molecular Weight
[kg/kmol]
[g/mol]
[lb/lbmol]

Acetylene, C2H226.038
Air28.966
Ammonia (R-717)17.02
Argon, Ar39.948
Benzene78.114
n - Butane, C4H1058.124
1,2 - Butadiene54.092
1-Butene56.108
cis -2-Butene56.108
trans-2-Butene56.108
Butylene56.06
Carbon Dioxide, CO244.01
Carbon Disulphide76.13
Carbon Monoxide, CO28.011
Chlorine70.906
Cyclohexane84.162
Cyclopentane70.135
n - Decane142.286
Deuterium2.014
2,3 - Dimetylbutane86.178
2,2 - Dimethylpentane100.205
Diisobutyl114.232
Duoderane170.21
Ethane, C2H630.070
Ethene28.05
Ethyl Alcohol46.07
Ethylbenzene106.168
Ethyl Chloride64.515
3 - Ethylpentane100.205
Ethylene, C2H428.054
Fluorine37.996
Helium, He4.002602
n - Heptane100.205
n - Hexane86.178
Hydrochloric Acid36.47
Hydrogen, H22.016
Hydrogen Chloride36.461
Hydrogen Sulfide34.076
Hydroxyl, OH17.01
Isobutane (2-Metyl propane)58.124
Isobutene56.108
Isooctane210.63
Isopentane72.151
Isoprene68.119
Isopropylbenzene120.195
Krypton83.80
Methane, CH416.043
Methyl Alcohol32.04
Methyl Butane72.15
Methyl Chloride50.488
Methylcyclohexane98.189
Methylcyclopentane84.162
2 - Methylhexane100.205
2 - Methylpentane86.178
Natural Gas19.00
Neon, Ne20.179
Neohexane86.178
Neopentane72.151
Nitric Oxide, NO30.006
Nitrogen, N228.0134
Nitrous Oxide, N2O44.013
n - Nonane128.259
n - Octane114.232
Oxygen, O231.9988
Ozone47.998
n - Pentane72.151
Pentylene70.08
Propane, C3H844.097
Propene42.081
Propylene42.08
R-11137.37
R-12120.92
R-2286.48
R-114170.93
R-123152.93
R-134a102.03
R-61160.05
Styrene104.152
Sulfur32.02
Sulfur Dioxide (Sulphur Dioxide)64.06
Sulfuric Oxide48.1
Toluene, toluol92.141
Triptane100.205
Xenon131.30
o - Xylene, xylol106.168
Water Vapor - Steam, H2O18.02

Related Topics

  • Material Properties - Material properties for gases, fluids and solids - densities, specific heats, viscosities and more

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  • Acetone - Thermophysical Properties - Chemical, physical and thermal properties of acetone, also called 2-propanone, dimethyl ketone and pyroacetic acid. Phase diagram included.
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  • Benzene - Thermophysical properties - Chemical, physical and thermal properties of benzene, also called benzol. Phase diagram included.
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  • Carbon dioxide - Prandtl Number - Figures and table showing changes in Prandtl number for carbon dioxide with changes in temperature and pressure
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  • Gases - Molar Specific Heat - Molar specific heats of gases at constant volume
  • Gases - Specific Gravities - Specific gravity of air, ammonia, butadiene, carbon dioxide, carbon monoxide and some other common gases
  • Hydrocarbones - Vapor Pressure - Vapor pressure versus temperature for propane, n-butane, n-heptane and n-pentane
  • Hydrogen - Thermophysical Properties - Chemical, Physical and Thermal Properties of Hydrogen - H2
  • Melting point from molecular weight - Calculation of melting point of hydrocarbons from molecular weight (molar mass)
  • Methane - Thermophysical Properties - Chemical, Physical and Thermal Properties of Methane - CH4. Phase diagram included.
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  • Mole Fraction of Water Vapor in Moist Air - Mole fraction of water vapor is the ratio of water molecules - to air and water molecules
  • Specific Heat and Individual Gas Constants of Gases - Specific heat at constant volume, specific heat at constant pressure, specific heat ratio and individual gas constant - R - common gases as argon, air, ether, nitrogen and many more ..
  • Total and partial pressure - Dalton's law of partial pressures - How to calculate total pressure and partial pressures for gas mixtures from Ideal Gas Law
  • Vapor and Steam - Introduction to vapor and steam

Tag Search

  • en: molecular weight gas vapor vapour
  • es: peso molecular de vapor de vapor de gas
  • de: Molekulargewicht Gas-Dampf-Dampf

Definition and molecular weight (molar mass) of some common substances

The molecular weight of a substance, also called the molar mass, M, is the mass of 1 mole of that substance, given in M gram.

In the SI system the unit of M is [kg/kmol] and in the English system the unit is [lb/lbmol], while in the cgs system the unit of M is [g/mol]. Molecular weight is represented by thesame number in all unit systems regardless of the system used. For this reason, in many cases the unit for the molecular weight is not mentioned; however, one must realize that it is not a dimensionless parameter.

The molecular weight of a pure compound is determined from its chemical formula and the atomic weights of its elements. The atomic weights of the elements found in organic substances are C = 12.011, H = 1.008, S = 32.065, O = 15.999, and N = 14.007.
Example: The molecular weight of ethanol (C2H5OH)
To calculate the molecular weight of ethanol, the molecular weight of each atom in the molecule is summed:

Methanol = 2*12.011[kg/kmol] + 6*1.008[kg/kmol] + 1*15.999 [kg/kmol] = 46.069 [kg/kmol]

See also Physical data for hydrocarbons, Physical data for alcohols and carboxylic acids, Physical data for organic nitrogen compounds and Physical data for organic sulfur compounds

Substance

Molecular Weight
[kg/kmol]
[g/mol]
[lb/lbmol]

Acetylene, C2H226.038
Air28.966
Ammonia (R-717)17.02
Argon, Ar39.948
Benzene78.114
n - Butane, C4H1058.124
1,2 - Butadiene54.092
1-Butene56.108
cis -2-Butene56.108
trans-2-Butene56.108
Butylene56.06
Carbon Dioxide, CO244.01
Carbon Disulphide76.13
Carbon Monoxide, CO28.011
Chlorine70.906
Cyclohexane84.162
Cyclopentane70.135
n - Decane142.286
Deuterium2.014
2,3 - Dimetylbutane86.178
2,2 - Dimethylpentane100.205
Diisobutyl114.232
Duoderane170.21
Ethane, C2H630.070
Ethene28.05
Ethyl Alcohol46.07
Ethylbenzene106.168
Ethyl Chloride64.515
3 - Ethylpentane100.205
Ethylene, C2H428.054
Fluorine37.996
Helium, He4.002602
n - Heptane100.205
n - Hexane86.178
Hydrochloric Acid36.47
Hydrogen, H22.016
Hydrogen Chloride36.461
Hydrogen Sulfide34.076
Hydroxyl, OH17.01
Isobutane (2-Metyl propane)58.124
Isobutene56.108
Isooctane210.63
Isopentane72.151
Isoprene68.119
Isopropylbenzene120.195
Krypton83.80
Methane, CH416.043
Methyl Alcohol32.04
Methyl Butane72.15
Methyl Chloride50.488
Methylcyclohexane98.189
Methylcyclopentane84.162
2 - Methylhexane100.205
2 - Methylpentane86.178
Natural Gas19.00
Neon, Ne20.179
Neohexane86.178
Neopentane72.151
Nitric Oxide, NO30.006
Nitrogen, N228.0134
Nitrous Oxide, N2O44.013
n - Nonane128.259
n - Octane114.232
Oxygen, O231.9988
Ozone47.998
n - Pentane72.151
Pentylene70.08
Propane, C3H844.097
Propene42.081
Propylene42.08
R-11137.37
R-12120.92
R-2286.48
R-114170.93
R-123152.93
R-134a102.03
R-61160.05
Styrene104.152
Sulfur32.02
Sulfur Dioxide (Sulphur Dioxide)64.06
Sulfuric Oxide48.1
Toluene, toluol92.141
Triptane100.205
Xenon131.30
o - Xylene, xylol106.168
Water Vapor - Steam, H2O18.02

Related Topics

  • Material Properties - Material properties for gases, fluids and solids - densities, specific heats, viscosities and more

Related Documents

Relative Atomic Mass Of H2o

  • Acetone - Thermophysical Properties - Chemical, physical and thermal properties of acetone, also called 2-propanone, dimethyl ketone and pyroacetic acid. Phase diagram included.
  • Air - Molecular Weight and Composition - Dry air is a mixture of gases where the average molecular weight (or molar mass) can be calculated by adding the weight of each component
  • Benzene - Thermophysical properties - Chemical, physical and thermal properties of benzene, also called benzol. Phase diagram included.
  • Butane - Thermophysical Properties - Chemical, physical and thermal properties of n-Butane
  • Carbon dioxide - Prandtl Number - Figures and table showing changes in Prandtl number for carbon dioxide with changes in temperature and pressure
  • Carbon Dioxide - Thermophysical Properties - Chemical, physical and thermal properties of carbon dioxide. Phase diagram included.
  • Compression and Expansion of Gases - Isothermal and isentropic gas compression and expansion processes
  • Ethylene - Thermophysical Properties - Chemical, physical and thermal properties of ethylene, also called ethene, acetene and olefiant gas. Phase diagram included.
  • Flame Temperatures Gases - Adiabatic flame temperatures for common fuel gases - propane, butane, acetylene and more - air or oxygen atmosphere
  • Gases - Densities - Densities and molecular weights of some common gases - acetylene, air, methane, nitrogen, oxygen and others ..
  • Gases - Explosion and Flammability Concentration Limits - Flame and explosion limits for gases - propane, methane, butane, acetylene and more
  • Gases - Molar Specific Heat - Molar specific heats of gases at constant volume
  • Gases - Specific Gravities - Specific gravity of air, ammonia, butadiene, carbon dioxide, carbon monoxide and some other common gases
  • Hydrocarbones - Vapor Pressure - Vapor pressure versus temperature for propane, n-butane, n-heptane and n-pentane
  • Hydrogen - Thermophysical Properties - Chemical, Physical and Thermal Properties of Hydrogen - H2
  • Melting point from molecular weight - Calculation of melting point of hydrocarbons from molecular weight (molar mass)
  • Methane - Thermophysical Properties - Chemical, Physical and Thermal Properties of Methane - CH4. Phase diagram included.
  • Mole and Avagadro's Number - The mole is the SI base unit for amount of substance
  • Mole Fraction of Water Vapor in Moist Air - Mole fraction of water vapor is the ratio of water molecules - to air and water molecules
  • Specific Heat and Individual Gas Constants of Gases - Specific heat at constant volume, specific heat at constant pressure, specific heat ratio and individual gas constant - R - common gases as argon, air, ether, nitrogen and many more ..
  • Total and partial pressure - Dalton's law of partial pressures - How to calculate total pressure and partial pressures for gas mixtures from Ideal Gas Law
  • Vapor and Steam - Introduction to vapor and steam

Tag Search

Atomic Weight Of Water

  • en: molecular weight gas vapor vapour
  • es: peso molecular de vapor de vapor de gas
  • de: Molekulargewicht Gas-Dampf-Dampf