Question

Calculate the number of atoms in a 1.94 x 10^3 g sample of calcium

Answer 1

`n = (m)/(M)`


`n = (1.94*10^3)/(40.08)`


`n = 48.40 mol`

Then,


`N = n*Na`

`N = 48.40*6.02*10^(23)`

`N= 2.94*10^(25)` atoms

Hope this helps !

Photon

Answer 2

1.94 *10^3 grams calcium contains 2.9*10^25 calcium atoms

Step-by-step explanation:

Step 1: Data given

Mass of Calcium = 1.94 *10³ grams = 1940 grams

Molar mass of Calcium = 40.08 g/mol

Number of Avogadro = 6.022 * 10^23 / mol

Step 2: Calculate moles of Calcium

Moles Calcium = mass calcium / molar mass Calcium

Moles Calcium = 1940 grams / 40.08 g/mol

Moles Calcium = 48.40 moles

Step 3: Calculate number of atoms

Number of Calcium atoms = moles calcium * Number of Avogadro

Number of Calcium atoms = 48.40 moles * 6.022 *10^23 / mol

Number of Calcium atoms = 2.9 *10^25 atoms

1.94 *10^3 grams calcium contains 2.9*10^25 calcium atoms