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The size of an atom is so small that it is difficult to accurately measure the number of atoms of a chemical compound. To be able to measure an exact amount of a substance, scientists use a unit called mp to represent a definite number of atoms. One mp of substance is defined as equivalent to the number of carbon atoms present in 12 grams of the isotope carbon 12, which is about 6,022 x 10 23 atoms. This value is called Avogadro’s number, or Avogadro’s constant. [1] X Research Source This is also referred to as the number of atoms present in 1 mp of any element, and 1 mp of the mass of a substance is called the mp mass of that substance.
Steps
Calculate the mass mp of an element
- For example, with hydrogen, the average atomic mass is 1.007; the average atomic mass of carbon is 12.0107; the average atomic mass of oxygen is 15.9994; chlorine has an average atomic mass of 35.453.
- Some elements exist in nature as molecules consisting of two or more identical atoms. That is, if you want to calculate the mass mp of compounds made up of more than one atom, such as hydrogen gas, oxygen gas or chlorine gas, you need to determine the average atomic mass of the compound and then multiply this value with the mass constant mp, ”then” multiplies the product just found by 2.
- With H 2 : 1,007 x 2 = 2.014 grams per mp; for O 2 : 15.9994 x 2 = 31.9988 grams per mp; and Cl 2 : 35.453 x 2 = 70,096 grams per mp.
- One way to remember atoms with two molecules is to memorize the sentence: “Have No Fear Of Ice Cpd Beverages” (the initials are for Hydrogen, Nitrogen, Fluorine, Oxygen, Iodine, Chlorine, Bromine) .
Calculate the mass mp of the compound
- Where HCl has one hydrogen atom and one chlorine atom.
- The glucose molecule C 6 H 12 O 6 has 6 carbon atoms, 12 hydrogen atoms and 6 oxygen atoms.
- The average atomic masses of the elements that make up hydrochloric acid are as follows: hydrogen 1,007 g/mp and chlorine 35.453 g/mp.
- The average atomic mass of the elements that make up the glucose molecule are: carbon, 12,017 g/mp; hydrogen, 1,007 g/mp; and oxygen, 15.9995 g/mp.
- In the case of hydrochloric acid, HCl, the mass mp of the hydrogen element is 1,007 g/mp, of chlorine is 35,453 g/mp.
- In the case of glucose, C 6 H 12 O 6 , the mass mp of each element is as follows: carbon, 12.0107 x 6 = 72.0642 g/mp; hydrogen, 1,007 x 12 = 12,084 g/mp; oxygen, 15.9995 x 6 = 95.9964 g/mp.
- The mass mp of hydrochloric acid is 1,007 + 35.453 = 36,460 g/mp. 36.46 grams is the mass of 1 mp of hydrochloric acid.
- The mp mass of glucose is 72.0642 + 12,084 + 95.9964 = 180.1446 g/mp. So each mp of glucose has a mass of 180.14 grams.
Advice
- Although in most cases the average atomic mass is recorded to the nearest 1 in 1000 (4 decimal places), in laboratories the mass mp is often reduced to 2 decimal places, sometimes even less, for large molecules. Thus, in the laboratory case, the mass mp of hydrochloric acid can be written as 36.46 grams per mp, of glucose as 180.14 grams per mp.
Things you need
- Chemistry reference book or periodic table of chemical elements
- Computer
This article is co-authored by a team of editors and trained researchers who confirm the accuracy and completeness of the article.
The wikiHow Content Management team carefully monitors the work of editors to ensure that every article is up to a high standard of quality.
This article has been viewed 124,791 times.
The size of an atom is so small that it is difficult to accurately measure the number of atoms of a chemical compound. To be able to measure an exact amount of a substance, scientists use a unit called mp to represent a definite number of atoms. One mp of substance is defined as equivalent to the number of carbon atoms present in 12 grams of the isotope carbon 12, which is about 6,022 x 10 23 atoms. This value is called Avogadro’s number, or Avogadro’s constant. [1] X Research Source This is also referred to as the number of atoms present in 1 mp of any element, and 1 mp of the mass of a substance is called the mp mass of that substance.
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