Question

How many atoms are in a sample of 72.8 grams calcium (Ca)?

1.76 × 1027 atoms
1.09 × 1024 atoms
4.85 × 10-21 atoms
3.02 × 10-24 atoms

Answer 1

the second one right?

Answer 2

@GAzela1997

Answer 3

@dhiraj123

Answer 4

first u have to convert 72g of ca to moles

Answer 5

how much did u get

Answer 6

1.09 × 10^24 atoms

Ca is about 40 g/ mol

and 1 mol is 6.02214179×10^23 atoms

Answer 7

u r right

Answer 8

oh oh ok thanks!