Cryolite, Na3AlF6(s), an ore used in the production of aluminum, can be synthesized using aluminum oxide. Balance the equation for the synthesis of cryolite.

equation:
Al2O3 (s) + NaOH (l) + HF (g) -> Na3AlF6 + H2O (g)
Al2O3(s)+NaOH(l)+HF(g)⟶Na3AlF6+H2O( g)
If 13.1 kg of Al2O3(s), 58.4 kg of NaOH(l), and 58.4 kg of HF(g) react completely, how many kilograms of cryolite will be produced?
mass of cryolite produced:
kg Na3AlF6
Which reactants will be in excess?

Al2O3

NaOH

HF
What is the total mass of the excess reactants left over after the reaction is complete?
total mass of excess reactants:
kg

Benzonitrile (c6h5cn) is reduced to two different products depending on the reducing agent used. treatment with lithium aluminum hydride followed by water forms k, which has a molecular ion in its mass spectrum at 107 and the following ir absorptions: 3373, 3290, 3062, 2920, and 1600 cm-1. treatment with a milder reducing agent forms l, which has a molecular ion in its mass spectrum at 106 and the following ir absorptions: 3086, 2850, 2820, 2736, 1703, and 1600 cm-1. l shows fragments in its mass spectrum at m/z = 105 and 77. propose structures for k and l and choose an explanation for how this could be concluded.