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kow [346]
2 years ago
10

The standard on which the atomic mass unit is based is the mass of a

Chemistry
1 answer:
pashok25 [27]2 years ago
3 0

Answer;

D. carbon-12 atom

Explanation;

-One atomic mass unit is the mass that is exactly equal to one-twelfth the mass of one carbon-12 atom. Therefore, the mass of carbon-12 is 12 amu and this provides the standard that is used in measuring the atomic mass of all other elements.

-The atomic mass of carbon is 12.01 and not 12.00 in the periodic table.

-Due to the fact that there are more than one element for most naturally occurring elements, the average mass of the naturally occurring mixture of isotopes is taken while determining the atomic mass of an element.

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⚛ 6.022 × 1023 is known as the Avogadro Number or Avogadro Constant and is given the symbol NA

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· n = amount of substance in moles (mol)

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Here we have 25.0 g/(18.0g/mole) = 1.39 moles water (3 sig figs).

Multiply 1.39 moles times the definition of a mole to arrive at the actual number of water molecules:

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N = n × (6.022 × 10^23)


1 grams H2O is equal to 0.055508435061792 mol.

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N = n × NA

N = 1.2767 × (6.022 × 10^23)

N= 176.26

N=
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