What Is The Mass Of 1 Atom Of Hydrogen In Kg – Home » Scientific Notes Publications » Chemistry » Chemistry Notes » Calculating the gram mass of a water molecule
Using the periodic table and Avogadro’s number, it is easy to calculate the mass of a water molecule in grams.
What Is The Mass Of 1 Atom Of Hydrogen In Kg
Learning to calculate the mass of a water molecule in grams is a useful exercise because it reinforces concepts of atomic weight, molecular formulas, and Avogadro’s number. Here’s how you find the mass of a molecule and why this value is approximate.
Calculate Mass Vi One Atom Of Nitrogen In Gram. Mass Of 6.022×1023 Atoms
Mass given in daltons (Da) or atomic mass units (mass) is approximately equal to the molar mass of an atom or compound. For example, the molar mass of hydrogen is 1.008 grams, so the mass of one hydrogen atom is approximately 1.008 Da or 1.008 amu. Also, the mass of one molecule of carbon dioxide is expressed as its molar mass, Da or amu. See the periodic table for carbon dioxide for the atomic masses of carbon (12.011) and oxygen (15.994). Add the masses of the elements for the molar mass (12.011 + 2 × 15.994 = 44.0). The mass of one molecule of carbon dioxide is 44.0 Da or 44.0 amu. This quantity is also called “molecular mass”.
Mass in grams is slightly different. Again, start with the molecular formula of the compound. Look up the atomic masses of each element in the periodic table. Add the mass of each element. If there is a subscript after the element symbol, multiply the atomic mass by that number. This gives the molar mass of the compound, which is grams per mole.
But Avogadro’s compound has about a thousand molecules. In other words, there are 6.022 × 10 in each mole of the compound
Molecules. So divide the mass by Avogadro’s number to get the gram compound. For carbon dioxide, the mass in grams of one molecule is 44.0 g/mol ÷ 6.022 × 10
Calculate The Mass Of 1 Atom Of Nitrogen
O. The 2 lines after the hydrogen (H) symbol mean that each water molecule contains two hydrogen atoms. There is no subscript after the oxygen (O) symbol, so you know that each molecule contains one atom of oxygen.
Now find the mass of water in thousand grams. It is the sum of atomic masses, hydrogen masses, and oxygen masses in a molecule. From the periodic table, each hydrogen atom has a mass of 1.008 g/mol, and an oxygen atom has a mass of 15.994 g/mol. The mass of water is 2 × 1.008 + 15.994 = 18.01 g/mol.
Water molecules. Thus, the mass of a water molecule is the molar mass (18.01 g/mol) divided by Avogadro’s number (6.022 × 10).
