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there are 1.806x10^25 molecules of water (H20). how many moles of water does the sample contain?
a: 30.0 moles
b: 90.0 moles
c: 1.08 x 10^48 moles
d: 6.02 x 10^24 moles

Respuesta :

MissPhiladelphia
Avogadro's number represents the number of units in one mole of any substance. This has the value of 6.022 x 10^23 units / mole. This number can be used to convert the number of atoms or molecules into number of moles. We calculate as follows:

  1.806x10^25 molecules H2O ( 1 mol / 6.022 x 10^23 molecules ) = 29.99 mole H2O = 30 moles------> OPTION A

Answer : The number of moles of water sample contains are, 30.0 moles

Explanation : Given,

Given molecules of water = [tex]1.806\times 10^{25}[/tex]

According to the mole concept,

As, [tex]6.022\times 10^{23}[/tex] molecules of water present in 1 mole of water.

So, [tex]1.806\times 10^{25}[/tex] molecules of water present in [tex]\frac{1.806\times 10^{25}}{6.022\times 10^{23}}=29.99\approx 30.0[/tex] mole of water.

Therefore, the number of moles of water sample contains are, 30.0 moles

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