A) moles of silver = mass of silver / molar mass of silver = 100
g / 108 g/mol = 0.926 moles
B) C9H7N
Molar mass = (9 x 12) + (7 x 1) + 14 = 129 g/mol
C)Â Â Â Â Â Â C3H8Â Â +
5O2Â Â Â ----------------> 3CO2 + 4H2O
        1
mol       5 mol
         44.2
g    5 x32 g = 160 g
         8.8
g          Â
?
                 Â
? = (8.8 g/ 44.2 g ) x 160 g oxygen
                     Â
= 31.85 g of oxygen
Therefore,
31.85 grams of oxygen are required to burn 8.8 grams of C3H8
