calculate the mass
0.4 mole of CO2 (At Mass of C = 12 &O=16 a.m.u) (17.6g)

Molar mass of CO2 = 44 g mol-1 
Mass of 1 mole of CO2 = 44 g
Mass of 0.4 mole of CO2 = 44×0.4                                               = 17.6 g 
 

  • 7

the mass of 1 mole of CO2= 12(mass of C) + 16x2(mass of O2)=12+32=44g
therefore,
                0.4 moles of CO2= 44x0.4=17.6g
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