answersLogoWhite

0

You need to know the molar mass for Ca which is: 40.078 g/mol and avrogadros # or whatever which is: 6.022 x 10^23

So:

80.0g Ca x (1 mol Ca / 40.078 g Ca) = 1.996 mol Ca (this eliminated grams)

1.996 mol Ca x (6.022 x 10^23 atoms / 1 mol Ca) = 1.202 x 10^24 atoms of calcium

Just remember the fraction 6.022 x 10^23 atoms / 1 mol ! It's the same thing so you can flip it!

User Avatar

Wiki User

14y ago

Still curious? Ask our experts.

Chat with our AI personalities

BeauBeau
You're doing better than you think!
Chat with Beau
RafaRafa
There's no fun in playing it safe. Why not try something a little unhinged?
Chat with Rafa
CoachCoach
Success isn't just about winning—it's about vision, patience, and playing the long game.
Chat with Coach
More answers

First find how many moles are in 80.45g of Mg. The molecular weight of Mg is 24.305g (found on the Periodic Table) so there is one mol per 24.305g of Mg. 80.45/24.305=3.310 mol Mg

Once you know the moles of the sample you can use Avagadro's number to find the number of atoms. 6.02x10^23(3.310)=1.993x10^24 atoms of Mg

User Avatar

Wiki User

16y ago
User Avatar
User Avatar

Tara Burns

Lvl 1
3y ago
24

To find the number of atoms in 80.0 grams of calcium, you first need to determine how many moles of calcium are in 80.0 grams by dividing the mass by the molar mass of calcium, which is approximately 40.08 g/mol. Then, you use Avogadro's number (6.022 x 10^23) to convert moles to atoms.

User Avatar

AnswerBot

9mo ago
User Avatar

80.45 g (6.02 x 1023 at / 24.31 g) = 1.99 x 1024atoms

User Avatar

Wiki User

16y ago
User Avatar

Moles = mass/ relative Atomic Mass of Mg

= 80.45/ 24.3

= 3.31 moles (to 3 significant figures)

User Avatar

Wiki User

15y ago
User Avatar

roughly half a mole or 3.01E23 atoms. This is too easy! Didn't even need a calculator, did it in my head.

User Avatar

Wiki User

12y ago
User Avatar

1 gram of magnesium contain 0,2477.10e23 atoms.

User Avatar

Wiki User

7y ago
User Avatar

?

User Avatar

Anonymous

4y ago
User Avatar

Add your answer:

Earn +20 pts
Q: How many atoms of calcium are in 80.0 grams of calcium?
Write your answer...
Submit
Still have questions?
magnify glass
imp