How many atoms are in 1 mole of #Na_3PO_4#?

Answer 1

#5 * 10^(24)"atoms"#

In order to figure out how many atoms you get per mole of sodium triphosphate, #"Na"_3"PO"_4#, you must use the fact that one mole of any substance contains #6.022 * 10^(23)# atoms, molecules, or formula units of that substance.

We refer to this as Avogadro's number.

Since you're dealing with an ionic compound, one mole of sodium triphosphate will contain #6.022 * 10^(23)# formula units of sodium triphosphate.

Now, how many atoms are there in one unit of sodium triphosphate formula?

Looking at the chemical formula, you can see that one formula unit contains

Accordingly, a single formula unit will comprise a total of

#3 xx"Na" + 1 xx "P" + 4 xx "O" = "8 atoms"#

One mole of formula units will therefore contain

#6.022 * 10^(23)color(red)(cancel(color(black)("formula units"))) * "8 atoms"/(1color(red)(cancel(color(black)("formula unit")))) = 4.82 * 10^(24)"atoms"#

You should round this off to one sig fig, the number of sig figs you have in #1# mole, to get

#"no. of atoms" = color(green)(| bar(ul(5 * 10^(24)"atoms"))|)#

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Answer 2

Jose Ayala

10 atoms.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.