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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

Verified Answer :

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 = \(1.806\times 10^{25}\)

According to the mole concept,

As, \(6.022\times 10^{23}\) molecules of water present in 1 mole of water.

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

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

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