Moles contained in 50g mgcl2

Question

How many are contained in 50g mgcl2

Answer 1

To convert from mass to moles, we first need the molar mass of magnesium chloride (MgCl₂):

Molar mass_MgCl2 = (Molar mass_magnesium) + 2(Molar mass_chlorine)

= (24.31g/mol) + 2(35.45g/mol) = 95.21g/mol

Then, we divide the mass by the molar mass:

moles_MgCl2 = mass_MgCl2/MM_MgCl2 = (50g)/(95.21g/mol) = 0.5252mol_MgCl2

Answer 2

Calculate the molar mas of MgCl₂ as follows:

Mg: 24.305 x 1 = 24.305

Cl: 35.453 x 2 = 70.906

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MgCl₂ = 95.211 g/mol

Divide the mass by the molar mass:

(50 g)/(95.211 g/mol) = 0.525 moles but you would need to use the proper number of sig figs (one) so 0.5 moles