Answer:
Mg
Explanation:
Given data:
Number of atoms of Ca = 3.25×10²²
Mass of Mg = 2.45 g
which has greater mass = ?
Solution:
1 mole = 6.022 ×10²³ atoms
3.25×10²² atoms × 1 mol/6.022 ×10²³ atoms
0.54×10⁻¹ mol
0.054 mol
Mass of Ca:
Mass = number of moles × molar mass
Mass = 0.054 mol × 40 g/mol
Mass = 2.16 g
Mass of Mg = 2.45 g
The 3.25×10²² atoms of Ca has 2.16 g mass while the other given Mg has 2.45 g mass. Thus Mg has greater mass.
