Question

ribose is an important sugar that is found in DNA and RNA.Ribose has a molar mass of 150g/mol,and a percent composition of 40.0%C,6.67%H,and 53.5%O.What is the molecular formula for ribose

Answer 1

40.0 gC x 1 mol C/12.0 gC=3.33 moles of C ----- divide by smallest
6.67 gH x 1 mol H/ 1.0 gH= 6.7 moles of H ------ CH2O= (12 + 2 + 16)= 30g
53.3 gO x 1mol O/ 15.0 gO=3.33 moles of O ----- 150g/30g= 5x
=C5H10O5