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.

0.25 mol NO2 (1 mol N/ 1 NO2) ( 6.022 x 10^23 atoms / mol ) = 1.5055x10^23 atoms

obasola1

Answer:

1.510^23 atoms

Explanation:

What is the total number of nitrogen atoms in 0.25 mole of no2 gas?

mole is the amount of a substance. Its is calculated as mass of a substance over molecular mass(g/mol).

it contains 1 avogadro constant

1 mol=6.0210^23 avogadros constant

0.25mol=x

so cross and multiply to get the value of x

6.022140857(
74
)
×
10
^23

0.256.02210^23

nitrogen atoms in such a molar quantity of nitric oxide,

1.5*10^23 atoms

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