Question

Which of the following contains the largest mass percent hydrogen?

a.10.0 g H₂S

b.10.0 g H₂O

c.10.0 g C₂H₆

d.10.0 g CH₄

Answer 1

= 0.283 moe No.of moles of H, S = MASS Of My S. 10.09 mw of H₂S 34.1 gmoet No. of moles of H= ax 0.293= 0.586 mol mass of H = 0.586 mol x 1.0089, = 0.5818 MASS PERCENT of H = 0.5819 xico - 15.8!% | mol - Toiog No. of moles of H₂O = 1000g = 0.556 mol R 18 gmolt No. of moles of H = 2x 0,556 = lolla mor mass of H = 1.112 mol x 1.008 GImol = 1.1219 mass PERCENT op H 161218 g 100 - 11.27 - 10.og No. of moles of Cato = 10.09 . 0.333 moe 30.07 g more No. of moles of H: 6x 0.333 mol = 1.998 mol mass of H= 1.998 nol x 10008 Slmol = 2.014 g mass percent of H = 2:0142 x 100 = 120.14% | 10.08 No of moles of Cha = 10:0g 16.04 amor alo. of moles of H= 4x 0.623 = 2.492 mol mass of H = 2.492 mol x 10008 8/mol = 2,512 MASS PERCENT OF H= 2.512g x 100 = 1250 12% e= 0.623 mol 10.08 LARGEST MASA PERCENT OF HYDROGEN (do 10:0g CHA .