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

First find the moles
moles of the calcium= 72.8 / 40
moles of calcium in 72.8g = 1.82mol

number of atoms= moles x Avogadro constant
atoms = 1.82 x 6.02x10+23
so the number of atoms is 1.096x10+24

Woah that’s a lot to read xd i’ll try though. i’ll get back t you if. i know the andwer