The compound diborane, B2H6. was at one time consid for use as a rocket fuel. It

Question

The compound diborane, B2H6. was at one time consid for use as a rocket fuel. Its combustion reaction B2H6 (g) + 3 02(I) - > 2 HBO2 (g) + 2 H 20 (I) The fact HB0 2 . a reactive compound, was produced rather than the expected inert 6 203 was a factor in the discontinuation of the research of diborane for rocket fuel. What mass of the liquid oxygen ( LOX ) would be required I burn 257 B2H6 by this combustion reaction? 6066365 if Acrylonitrile ( C 3H3 N ) is the starting material for many Synthetic carpets and fabrics. It is produced by the following reaction; 2C3H6 (g) + 2NH 3 (g) + 3O 2 (g) - > 2C 3H3N ( g) + 6H20 (g) If 15.0 g C3H6 , 10.0 g O2 , and 5.00 g NH 3 are reacted, what mass of the acrylonitrile can be produced assuming 100% yield?

Explanation / Answer

C3H6 = 42, 15/42 = 0.35 mol
NH3 = 17, 5/17 = 0.29 mol
O2 = 32, 10/32 = 0.31 mol
C3H3N = 53
0.35mol C3H6 produce 0.35mol C3H3N
0.29 mol NH3 produces 0.29 mol C3H3N
0.31mol O2 produces 2/3 x 0.31 = 0.21 mol C3H3N
As there are fewer moles of O2, then C3H6 and NH3 must be in excess.
Therefore the maximum amount of product that can be made is dependent upon the O2 molar concentration.
So, the max number of moles of product that can be made is 0.21 mol.
Mass of C3H3N = 0.21 x 53 = 11.13g assuming 100% yield.

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