What mass of oxygen is contained in a 5.8 g sample of NaHCO3?

Molar mass of NaHCO3 is 83.9. moles of Na ... O3 = 5.8/83.9

=0.0691

for every mole of Na ... O3 there are 3 O

n (O) = n (NaHCO3) x3

= 0.207

mass of O is the moles x molar mass (16)

therefore the mass of O is 3.3 grams