number of moles and formula units in 57.5 g lithium sulfate ; number of lithium ions, sulfate ions, S atoms, a

Answer 1

Lithium sulfate is Li2SO4

Add up the mass of 2 Li + 1 S + 4 O (14 + 32 + 64) = 110

Divide mass given by molecular mass to get moles of molecules

57.5 / 110 = 0.523 moles of Li2SO4

To get moles of each ion multiply 0.523 moles x subscripts of each ion

moles Li 1+ = 2 x 0.523 = 1.046 mol
moles SO4 2- = 1 x 0.523 = 0.523 mol
[moles S = 1 x 0.523 = 0.523 mol]
[moles O = 4 x 0.523 = 2.092 mol]

To get the number of ions or atoms just multiply each answer above by Avogadro's number (6.02 x 10^23)

Answer 2

Lithium Sulfate