Question

How many atoms are in 4.5 moles of nitrogen

Answer 1

Answer:one mole of stuff (atoms, molecules, eggses), there are NA individual items of that stuff. So, there are 4.5 × NA BCl3 molecules; i.e. 4.5 × 6.022×1023 ≅ 27×1023 individual molecules of BCl3

Step-by-step explanation:

Answer 2

`\boxed {\boxed {\sf About \ 2.7 *10^(24)\ atoms\ N }}`

Step-by-step explanation:

To convert from moles to atoms, Avogadro's Number: 6.022*10²³ must be used. This number tells us the amount of particles (atoms, molecules, etc) in 1 mole of a substance. In this case, the particles are atoms of nitrogen.

`\frac {6.022 *10^(23) \ atoms \ N}{1 \ mol \ N}`

Multiply by the given number of moles: 4.5

`4.5 \ mol \ N *\frac {6.022 *10^(23) \ atoms \ N}{1 \ mol \ N}`

The moles of nitrogen will cancel.

`4.5 \ *\frac {6.022 *10^(23) \ atoms \ N}{1 }`

The denominator of 1 can be ignored.

`4.5 \ *{6.022 *10^(23) \ atoms \ N}`

`2.7099*10^(24) \ atoms \ N`

The original measurement of moles had 2 significant figures, so our answer must have the same. For the number we calculated, that is the tenth place. The 0 in the hundredth place tells us to leave the 7.

`2.7 *10^(24)\ atoms\ N`

There are about 2.7*10²⁴ atoms of nitrogen in 4.5 moles.