Question

Convert 4.5 X 1022 molecules of H2O to moles. Group of answer choices: a) 2.71 x 10^49 b) 1.71 x 10^38 c) 2.1 x 10^21 d) 7.56 x 10^-2

Answer 1

4.5 x 10^22 molecules of
`H_2O`is equivalent to 7.47 x 10^-2 moles. None of the given options is answer.

Step-by-step explanation:

The number of moles of a substance is equal to the number of molecules of the substance divided by Avogadro's number (N_A). Avogadro's number is approximately 6.022 x 10^23 molecules/mol.

n_moles = n_molecules / N_A

where:

n_moles is the number of moles

n_molecules is the number of molecules

N_A is Avogadro's number

Plugging in the values we know, we get:

n_moles = (4.5 x 10^22 molecules) / (6.022 x 10^23 molecules/mol) = 7.47 x 10^-2 moles

Therefore, 4.5 x 10^22 molecules of
`H_2O` is equal to 7.47 x 10^-2 moles.

None of the given options is answer.