Answer is: mass <span>of 4,30 moles of sodium</span> is 98800 mg. n(Na) = 4,30 mol. m(Na) = ? m(Na) = n(Na) · M(Na). m(Na) = 4,30 mol · 23 g/mol. m(Na) = 98,90 g. m(Na) = 98,90 g · 1000 mg/1g. m(Na) = 98900 mg. n - amount of substance. m - mass of substance. M - molar mass of substance.