What is the difference between molecular mass and molar mass? Calculate the molecular mass and molar mass for carbon momoxide
Answers
Answered by
0
Firstly, molecule refers to the composition of similar or different atoms arranged in ratios. The molecules can form chemical compounds subject to the physical and chemical properties of each molecule.
In a nutshell, a molecular mass refers to the total mass of a substance. It sums the average masses of individual atoms in a molecule of that particular substance.
In order to determine the molecular mass of a compound X, you have to add the atomic masses of all the elements in the composition including their multiplications as per the subscripts in the formula.
We will illustrate with an example below. These atomic masses are taken directly from the periodic table of elements. They are measured in atomic mass units (amu) and so is the molecular mass.
Example 1:
Determine the molecular mass of H2O and CH3CH2OH.
Answer:
You have to assess the compositions of the given molecular formulas and derive their atomic masses from the periodic table. Take into account the subscripts.
For example, H2O indicates that there are two hydrogen atoms and one oxygen atom. The atomic mass of Hydrogen is, from the periodic table, 1.0079 amu and that of oxygen is 15.9994. The molecular mass of the compound is 2(1.0079) + 15.9994 = 18.0152 amu.
And to determine the molecular mass of ethanol, the other formula given in the question, we follow the same steps. There are 2 Carbon atoms, 6 Hydrogen atoms and 1 Oxygen atom. The atomic mass of Carbon atom is 12.011 amu. That said, the molecular mass of CH3CH2OH is 2(12.011) + 6(1.0079) + 1(15.9994) = 46.069 amu. For your exercise, calculate the molecular formula of ethane (C2H4) and CO2.

What is Molar Mass?
Now regarding the molar mass concept, it is defined as the mass in kilograms or grams of a mole of a substance. Usually, the units for molar mass are gram/mol. A mole of an oxygen element has a mass of 15.9994 grams. Thus the molar mass would be 15.9994 g/mol. For a carbon dioxide compound, for example, the molar mass is defined as the mass of 1 mole of molecules in that compound. Avogadro’s number, 6.022 x 1023 is often used to relate the number of atoms, molecules and other units that a molar mass is equal to. For instance, a molar mass of H2O would be equal to the mass in grams per mole of 6.022 x 1023 water
In a nutshell, a molecular mass refers to the total mass of a substance. It sums the average masses of individual atoms in a molecule of that particular substance.
In order to determine the molecular mass of a compound X, you have to add the atomic masses of all the elements in the composition including their multiplications as per the subscripts in the formula.
We will illustrate with an example below. These atomic masses are taken directly from the periodic table of elements. They are measured in atomic mass units (amu) and so is the molecular mass.
Example 1:
Determine the molecular mass of H2O and CH3CH2OH.
Answer:
You have to assess the compositions of the given molecular formulas and derive their atomic masses from the periodic table. Take into account the subscripts.
For example, H2O indicates that there are two hydrogen atoms and one oxygen atom. The atomic mass of Hydrogen is, from the periodic table, 1.0079 amu and that of oxygen is 15.9994. The molecular mass of the compound is 2(1.0079) + 15.9994 = 18.0152 amu.
And to determine the molecular mass of ethanol, the other formula given in the question, we follow the same steps. There are 2 Carbon atoms, 6 Hydrogen atoms and 1 Oxygen atom. The atomic mass of Carbon atom is 12.011 amu. That said, the molecular mass of CH3CH2OH is 2(12.011) + 6(1.0079) + 1(15.9994) = 46.069 amu. For your exercise, calculate the molecular formula of ethane (C2H4) and CO2.

What is Molar Mass?
Now regarding the molar mass concept, it is defined as the mass in kilograms or grams of a mole of a substance. Usually, the units for molar mass are gram/mol. A mole of an oxygen element has a mass of 15.9994 grams. Thus the molar mass would be 15.9994 g/mol. For a carbon dioxide compound, for example, the molar mass is defined as the mass of 1 mole of molecules in that compound. Avogadro’s number, 6.022 x 1023 is often used to relate the number of atoms, molecules and other units that a molar mass is equal to. For instance, a molar mass of H2O would be equal to the mass in grams per mole of 6.022 x 1023 water
Answered by
0
Answer:
Relative molecular mass is defined as the ratio of the mass of the molecule to the unified atomic mass unit. ... ∙ For carbon monoxide (CO) Molecular mass = (Atomic mass of carbon) + (Atomic mass of oxygen) = 12 + 16 ⇒ 28 u. Molar mass: ∙ It is defined as the mass of one mole of a substance.
Explanation:
Similar questions