(B) The chemical formula of sodium oxide is $Na_2O$.The molar mass of $Na_2O = (2 \times 23) + 16 = 46 + 16 = 62 \ g/mol$.The number of moles is calcu

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(B) The chemical formula of sodium oxide is $Na_2O$.The molar mass of $Na_2O = (2 \times 23) + 16 = 46 + 16 = 62 \ g/mol$.The number of moles is calculated using the formula: $n = \frac{\text{mass}}{\text{molar mass}}$.$n = \frac{620 \ g}{62 \ g/mol} = 10 \ moles$.Therefore,the correct option is $B$.