ginareyes0423
12.07.2019 •
Chemistry
How many electrons are in 0.990 oz of a pure gold coin?
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Ответ:
Atomic number of gold, = 79 means there are 79 electrons in per atom of gold.
Atomic mass of gold = 196.967 gm
0.990 oz of gold is given.
Now, converting
So,
Now, for determining the number of moles, the formula for number of moles is:
Substituting the values:
1 mole of
So, for 0.1425 mole of
Since 1 atom of gold has 79 electrons so,
Number of electrons =
So, number of electrons in 0.990 oz of pure gold coin is .
Ответ:
El sonido es una onda que se crea por vibración y se propaga a través de un medio de un punto a otro. De modo que es basicamente una onda mecánica longitudinal.
Es una onda mecánica pues necesita un medio para propagarse,