Question

Calculate mass in grams of hydrogen present in 2.50g of each of following compounds.

a) benzene C_6H_6

b) Calcium Hydride

c) C_2H_5OH

d) C_3H_7O_3N

Answer 1

a) Coto Moler mass = (1286) + (1x6) - 789 78 g of C. Ho contains 6g of H --2.59 of 6 Ho contains 6x2.5 78 = 0.192 g oft b) Celcium hydride (Ca H2) +(142) = 429 - 42 g of Ca H₂ contains 2.50g of lata contains 2g of H 2 x 2.5 g = 0.125 g of H 42 E - - - c) - ₂ HS oH molar mass = (2x 1g) + (1x 5+ (1x16)+(1x1) - 469 46 g of C₂H5 OH contains og of H 2.5 g of C₂ H₂ ot contains y 6x2.5 42 - = 0.3579 of H -- d) CHO C₃ Hq O₂ W molar mass=(1283) #7 x 1) +(3x16) +14) - 1059 105g of C₂ H₂ O₂N contains 7 off 2.5 g of C₂ H₂ Oz N contains 7 x 2.5 g = 0.166 g FH