What is the mass of 3.5 moles of Li2O ?

The mass of Li2O : 104.58 grams

Given

3.5 moles of Li2O

Required

The mass

Solution

The mole is the number of particles contained in a substance

1 mol = 6.02.10²³

Moles can also be determined from the amount of substance mass and its molar mass

mol(n) = mass(m) : MW(molecular weight)

Input the value :

mass = mol x MW Li2O

mass =  3.5 mol x 29,88 g/mol

mass = 104.58 g grams

mass = 2.957 g

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