Question

How many moles are in 3.25 Grams MgC2O4

Answer 1

MgC₂O₄

From Periodic table, Mg = 24, C = 12, O = 16.

MgC₂O₄ = 24 + 2*12 + 4*16 = 24 + 24 + 64 = 112

112 grams is actually 1 mole of MgC₂O₄

1 gram will be : (1/112) mole of MgC₂O₄

3.25 grams will be = 3.25 / 112 = 0.029

3.25 grams is ≈ 0.029 Mole

Answer 2

Molar mass MgC₂O₄ = 112.3240 g/mol

1 mole ---------- 112.3240 g
? mole ---------- 3.25 g

moles = m / molar mass

moles = 3.25 / 112.3240

= 0.0289 moles

hope this helps!