define relative atomic mass.what is the atomic mass of magnesium and chlorine?
Answers
Answer:
The relative weighted average atomic mass for magnesium is 24.3 u. This is obtained by summing the product of the mass of each isotope of the element times the fractional abundance of that isotope. We usually shorten this and say the atomic mass of magnesium is 24.3 u. The atomic mass for chlorine is 35.45 u. The symbol for chlorine is Cl. The formula for elemental chlorine is Cl2. The molecular mass for elemental chlorine, Cl2, is 70.90 u, just two times the atomic mass. We can obtain the mass of a formula unit of MgCl2 by simply summing the atomic masses for each of the atoms in the formula. Therefore the formula mass of MgCl2 is 95.35 u.
But we still have a problem! The balances in the laboratory measure mass in units of grams, not u's. We need a relationship between atomic mass units (u) and grams. That relationship is given to us by the definition of the atomic mass unit. The 'u' is defined as one-twelfth of the mass of the isotope of 12C. The value is 1.66057 x 10-24 grams. Now we have a way to determine the mass of a single atom of an element, a molecule of an element or compound and the mass of a formula unit of an ionic compound.
Explanation:
Answer:
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Explanation:
The relative weighted average atomic mass for magnesium is 24.3 u. This is obtained by summing the product of the mass of each isotope of the element times the fractional abundance of that isotope. We usually shorten this and say the atomic mass of magnesium is 24.3 u. The atomic mass for chlorine is 35.45 u.